31878874478 has 16 divisors (see below), whose sum is σ = 52168178304. Its totient is φ = 14489634360.

The previous prime is 31878874427. The next prime is 31878874493. The reversal of 31878874478 is 87447887813.

It is a congruent number.

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, 761201 + ... + 801987.

It is an arithmetic number, because the mean of its divisors is an integer number (3260511144).

Almost surely, 2^31878874478 is an apocalyptic number.

31878874478 is a deficient number, since it is larger than the sum of its proper divisors (20289303826).

31878874478 is a wasteful number, since it uses less digits than its factorization.

31878874478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76327.

The product of its digits is 67436544, while the sum is 65.

The spelling of 31878874478 in words is "thirty-one billion, eight hundred seventy-eight million, eight hundred seventy-four thousand, four hundred seventy-eight".