31878874128 has 20 divisors (see below), whose sum is σ = 82353758288. Its totient is φ = 10626291360.

The previous prime is 31878874127. The next prime is 31878874129. The reversal of 31878874128 is 82147887813.

It is an interprime number because it is at equal distance from previous prime (31878874127) and next prime (31878874129).

It is not an unprimeable number, because it can be changed into a prime (31878874127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332071558 + ... + 332071653.

Almost surely, 2^31878874128 is an apocalyptic number.

It is an amenable number.

31878874128 is an abundant number, since it is smaller than the sum of its proper divisors (50474884160).

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

31878874128 is a wasteful number, since it uses less digits than its factorization.

31878874128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664143222 (or 664143216 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 57.

The spelling of 31878874128 in words is "thirty-one billion, eight hundred seventy-eight million, eight hundred seventy-four thousand, one hundred twenty-eight".