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99999666 = 23213271463
BaseRepresentation
bin1011111010111…
…01111110110010
320222011111202100
411331131332302
5201044442131
613531201230
72322661134
oct575357662
9228144670
1099999666
11514a1258
12295a6216
1317943600
14d3d1054
158ba47e6
hex5f5dfb2

99999666 has 72 divisors (see below), whose sum is σ = 238432896. Its totient is φ = 30270240.

The previous prime is 99999643. The next prime is 99999677. The reversal of 99999666 is 66699999.

It is a super-2 number, since 2×999996662 = 19999866400223112, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 215751 + ... + 216213.

It is an arithmetic number, because the mean of its divisors is an integer number (3311568).

Almost surely, 299999666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99999666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119216448).

99999666 is an abundant number, since it is smaller than the sum of its proper divisors (138433230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99999666 is a wasteful number, since it uses less digits than its factorization.

99999666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 552 counting only the distinct ones).

The product of its digits is 12754584, while the sum is 63.

The square root of 99999666 is about 9999.9832999861. The cubic root of 99999666 is about 464.1583665971.

The spelling of 99999666 in words is "ninety-nine million, nine hundred ninety-nine thousand, six hundred sixty-six".

Divisors: 1 2 3 6 9 13 18 26 39 71 78 117 142 169 213 234 338 426 463 507 639 923 926 1014 1278 1389 1521 1846 2769 2778 3042 4167 5538 6019 8307 8334 11999 12038 16614 18057 23998 32873 35997 36114 54171 65746 71994 78247 98619 107991 108342 156494 197238 215982 234741 295857 427349 469482 591714 704223 854698 1282047 1408446 2564094 3846141 5555537 7692282 11111074 16666611 33333222 49999833 99999666