99972321856 has 63 divisors (see below), whose sum is σ = 218117587513. Its totient is φ = 45429317120.

The previous prime is 99972321829. The next prime is 99972321871. The reversal of 99972321856 is 65812327999.

The square root of 99972321856 is 316184.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 31755240000 + 68217081856 = 178200^2 + 261184^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99972321794 and 99972321803.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27822396 + ... + 27825988.

Almost surely, 2^99972321856 is an apocalyptic number.

99972321856 is the 316184-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99972321856

99972321856 is an abundant number, since it is smaller than the sum of its proper divisors (118145265657).

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

99972321856 is an frugal number, since it uses more digits than its factorization.

99972321856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7220 (or 3606 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 61.

The spelling of 99972321856 in words is "ninety-nine billion, nine hundred seventy-two million, three hundred twenty-one thousand, eight hundred fifty-six".