99640956 has 24 divisors (see below), whose sum is σ = 233407440. Its totient is φ = 33083392.

The previous prime is 99640951. The next prime is 99640967. The reversal of 99640956 is 65904699.

It is a happy number.

It is a super-2 number, since 2×99640956² = 19856640225187872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99640951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13071 + ... + 19238.

It is an arithmetic number, because the mean of its divisors is an integer number (9725310).

Almost surely, 2^99640956 is an apocalyptic number.

It is an amenable number.

99640956 is an abundant number, since it is smaller than the sum of its proper divisors (133766484).

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

99640956 is a wasteful number, since it uses less digits than its factorization.

99640956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32573 (or 32571 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 48.

The square root of 99640956 is about 9982.0316569324. The cubic root of 99640956 is about 463.6027056479.

The spelling of 99640956 in words is "ninety-nine million, six hundred forty thousand, nine hundred fifty-six".