31428872888856 has 128 divisors (see below), whose sum is σ = 80291650982400. Its totient is φ = 10250073953280.

The previous prime is 31428872888807. The next prime is 31428872888867. The reversal of 31428872888856 is 65888827882413.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86872116 + ... + 87233148.

It is an arithmetic number, because the mean of its divisors is an integer number (627278523300).

Almost surely, 2^{31428872888856} is an apocalyptic number.

It is an amenable number.

31428872888856 is an abundant number, since it is smaller than the sum of its proper divisors (48862778093544).

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

31428872888856 is a wasteful number, since it uses less digits than its factorization.

31428872888856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361569 (or 361565 counting only the distinct ones).

The product of its digits is 2642411520, while the sum is 78.

The spelling of 31428872888856 in words is "thirty-one trillion, four hundred twenty-eight billion, eight hundred seventy-two million, eight hundred eighty-eight thousand, eight hundred fifty-six".