99697920 has 144 divisors (see below), whose sum is σ = 363995520. Its totient is φ = 22781952.

The previous prime is 99697909. The next prime is 99697963. The reversal of 99697920 is 2979699.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25026 + ... + 28734.

Almost surely, 2^99697920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99697920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181997760).

99697920 is an abundant number, since it is smaller than the sum of its proper divisors (264297600).

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

99697920 is a wasteful number, since it uses less digits than its factorization.

99697920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3740 (or 3726 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 51.

The square root of 99697920 is about 9984.8845761982. The cubic root of 99697920 is about 463.6910349007.

The spelling of 99697920 in words is "ninety-nine million, six hundred ninety-seven thousand, nine hundred twenty".