99787570920 has 384 divisors, whose sum is σ = 352864512000. Its totient is φ = 25313865984.

The previous prime is 99787570907. The next prime is 99787570933. The reversal of 99787570920 is 2907578799.

It is an interprime number because it is at equal distance from previous prime (99787570907) and next prime (99787570933).

It is a super-2 number, since 2×99787570920² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 44487319 + ... + 44489561.

It is an arithmetic number, because the mean of its divisors is an integer number (918918000).

Almost surely, 2^99787570920 is an apocalyptic number.

99787570920 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99787570920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176432256000).

99787570920 is an abundant number, since it is smaller than the sum of its proper divisors (253076941080).

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

99787570920 is a wasteful number, since it uses less digits than its factorization.

99787570920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491 (or 2475 counting only the distinct ones).

The product of its (nonzero) digits is 20003760, while the sum is 63.

The spelling of 99787570920 in words is "ninety-nine billion, seven hundred eighty-seven million, five hundred seventy thousand, nine hundred twenty".