85431557880 has 96 divisors (see below), whose sum is σ = 289724441760. Its totient is φ = 21791235840.

The previous prime is 85431557843. The next prime is 85431557891. The reversal of 85431557880 is 8875513458.

85431557880 is a `hidden beast` number, since 8 + 5 + 4 + 3 + 1 + 557 + 8 + 80 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5150631 + ... + 5167190.

It is an arithmetic number, because the mean of its divisors is an integer number (3017962935).

Almost surely, 2^85431557880 is an apocalyptic number.

It is an amenable number.

85431557880 is an abundant number, since it is smaller than the sum of its proper divisors (204292883880).

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

85431557880 is a wasteful number, since it uses less digits than its factorization.

85431557880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10317861 (or 10317854 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 54.

The spelling of 85431557880 in words is "eighty-five billion, four hundred thirty-one million, five hundred fifty-seven thousand, eight hundred eighty".