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9990666 = 2327372143
BaseRepresentation
bin100110000111…
…001000001010
3200210120121200
4212013020022
510024200131
6554045030
7150630210
oct46071012
920716550
109990666
115704154
123419776
1320ba54a
141480cb0
15d252e6
hex98720a

9990666 has 48 divisors (see below), whose sum is σ = 25419264. Its totient is φ = 2776032.

The previous prime is 9990661. The next prime is 9990667. The reversal of 9990666 is 6660999.

9990666 is a strobogrammatic number because it is the same when read upside-down.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9990661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3591 + ... + 5733.

It is an arithmetic number, because the mean of its divisors is an integer number (529568).

Almost surely, 29990666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9990666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12709632).

9990666 is an abundant number, since it is smaller than the sum of its proper divisors (15428598).

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

9990666 is a wasteful number, since it uses less digits than its factorization.

9990666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195 (or 2192 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 9990666 is about 3160.8014806375. The cubic root of 9990666 is about 215.3764164919.

The spelling of 9990666 in words is "nine million, nine hundred ninety thousand, six hundred sixty-six".

Divisors: 1 2 3 6 7 9 14 18 21 37 42 63 74 111 126 222 259 333 518 666 777 1554 2143 2331 4286 4662 6429 12858 15001 19287 30002 38574 45003 79291 90006 135009 158582 237873 270018 475746 555037 713619 1110074 1427238 1665111 3330222 4995333 9990666