90088821904 has 15 divisors (see below), whose sum is σ = 174549418617. Its totient is φ = 45043810656.

The previous prime is 90088821881. The next prime is 90088821931. The reversal of 90088821904 is 40912888009.

The square root of 90088821904 is 300148.

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., 4385088400 + 85703733504 = 66220^2 + 292752^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1163074 + ... + 1238110.

Almost surely, 2^90088821904 is an apocalyptic number.

90088821904 is the 300148-th square number.

It is an amenable number.

90088821904 is a deficient number, since it is larger than the sum of its proper divisors (84460596713).

90088821904 is an frugal number, since it uses more digits than its factorization.

90088821904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150082 (or 75039 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

Multiplying 90088821904 by its sum of digits (49), we get a square (4414352273296 = 2101036²).

The spelling of 90088821904 in words is "ninety billion, eighty-eight million, eight hundred twenty-one thousand, nine hundred four".