90812791840 has 24 divisors (see below), whose sum is σ = 214545221100. Its totient is φ = 36325116672.

The previous prime is 90812791829. The next prime is 90812791871. The reversal of 90812791840 is 4819721809.

It can be written as a sum of positive squares in 2 ways, for example, as 88501490064 + 2311301776 = 297492^2 + 48076^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283789815 + ... + 283790134.

Almost surely, 2^90812791840 is an apocalyptic number.

It is an amenable number.

90812791840 is an abundant number, since it is smaller than the sum of its proper divisors (123732429260).

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

90812791840 is a wasteful number, since it uses less digits than its factorization.

90812791840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567579964 (or 567579956 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 49.

The spelling of 90812791840 in words is "ninety billion, eight hundred twelve million, seven hundred ninety-one thousand, eight hundred forty".