31878714538 has 16 divisors (see below), whose sum is σ = 52169500224. Its totient is φ = 14489121760.

The previous prime is 31878714473. The next prime is 31878714589. The reversal of 31878714538 is 83541787813.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245331 + ... + 352057.

It is an arithmetic number, because the mean of its divisors is an integer number (3260593764).

Almost surely, 2^31878714538 is an apocalyptic number.

31878714538 is a deficient number, since it is larger than the sum of its proper divisors (20290785686).

31878714538 is a wasteful number, since it uses less digits than its factorization.

31878714538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120317.

The product of its digits is 4515840, while the sum is 55.

The spelling of 31878714538 in words is "thirty-one billion, eight hundred seventy-eight million, seven hundred fourteen thousand, five hundred thirty-eight".