99772321920 has 512 divisors, whose sum is σ = 345687367680. Its totient is φ = 24410800128.

The previous prime is 99772321849. The next prime is 99772321931. The reversal of 99772321920 is 2912327799.

It is a super-2 number, since 2×99772321920² (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 63 ways as a sum of consecutive naturals, for example, 110002107 + ... + 110003013.

It is an arithmetic number, because the mean of its divisors is an integer number (675170640).

Almost surely, 2^99772321920 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 99772321920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172843683840).

99772321920 is an abundant number, since it is smaller than the sum of its proper divisors (245915045760).

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

99772321920 is a wasteful number, since it uses less digits than its factorization.

99772321920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052 (or 1040 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 51.

The spelling of 99772321920 in words is "ninety-nine billion, seven hundred seventy-two million, three hundred twenty-one thousand, nine hundred twenty".