31328916978 has 32 divisors (see below), whose sum is σ = 65313293760. Its totient is φ = 10005894080.

The previous prime is 31328916977. The next prime is 31328917027. The reversal of 31328916978 is 87961982313.

It is not an unprimeable number, because it can be changed into a prime (31328916977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 664425 + ... + 710012.

It is an arithmetic number, because the mean of its divisors is an integer number (2041040430).

Almost surely, 2^31328916978 is an apocalyptic number.

31328916978 is an abundant number, since it is smaller than the sum of its proper divisors (33984376782).

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

31328916978 is a wasteful number, since it uses less digits than its factorization.

31328916978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374602.

The product of its digits is 3919104, while the sum is 57.

The spelling of 31328916978 in words is "thirty-one billion, three hundred twenty-eight million, nine hundred sixteen thousand, nine hundred seventy-eight".