99787734720 has 84 divisors (see below), whose sum is σ = 343228239120. Its totient is φ = 26610061824.

The previous prime is 99787734707. The next prime is 99787734721. The reversal of 99787734720 is 2743778799.

99787734720 is a `hidden beast` number, since 9 + 97 + 8 + 7 + 73 + 472 + 0 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (99787734721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17321380 + ... + 17327139.

Almost surely, 2^99787734720 is an apocalyptic number.

99787734720 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99787734720 is an abundant number, since it is smaller than the sum of its proper divisors (243440504400).

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

99787734720 is a wasteful number, since it uses less digits than its factorization.

99787734720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34648542 (or 34648529 counting only the distinct ones).

The product of its (nonzero) digits is 37340352, while the sum is 63.

The spelling of 99787734720 in words is "ninety-nine billion, seven hundred eighty-seven million, seven hundred thirty-four thousand, seven hundred twenty".