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999999090 = 232511111101
BaseRepresentation
bin111011100110101…
…100011001110010
32120200200012212100
4323212230121302
54021444432330
6243121241230
733531565146
oct7346543162
92520605770
10999999090
11473523132
1223aa93216
1312c23994c
1496b4b226
155cbd1060
hex3b9ac672

999999090 has 24 divisors (see below), whose sum is σ = 2599997868. Its totient is φ = 266666400.

The previous prime is 999999067. The next prime is 999999103. The reversal of 999999090 is 90999999.

It can be written as a sum of positive squares in 2 ways, for example, as 925193889 + 74805201 = 30417^2 + 8649^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5555461 + ... + 5555640.

Almost surely, 2999999090 is an apocalyptic number.

999999090 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

999999090 is an abundant number, since it is smaller than the sum of its proper divisors (1599998778).

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

999999090 is a wasteful number, since it uses less digits than its factorization.

999999090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11111114 (or 11111111 counting only the distinct ones).

The product of its (nonzero) digits is 4782969, while the sum is 63.

The square root of 999999090 is about 31622.7622133172. The cubic root of 999999090 is about 999.9996966666. Note that the first 3 decimals are identical.

The spelling of 999999090 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, ninety".

Divisors: 1 2 3 5 6 9 10 15 18 30 45 90 11111101 22222202 33333303 55555505 66666606 99999909 111111010 166666515 199999818 333333030 499999545 999999090