31388788891464 has 32 divisors (see below), whose sum is σ = 81003326173440. Its totient is φ = 10125415771200.

The previous prime is 31388788891463. The next prime is 31388788891511. The reversal of 31388788891464 is 46419888788313.

It is a self number, because there is not a number n which added to its sum of digits gives 31388788891464.

It is not an unprimeable number, because it can be changed into a prime (31388788891463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21094615447 + ... + 21094616934.

It is an arithmetic number, because the mean of its divisors is an integer number (2531353942920).

Almost surely, 2^{31388788891464} is an apocalyptic number.

It is an amenable number.

31388788891464 is an abundant number, since it is smaller than the sum of its proper divisors (49614537281976).

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

31388788891464 is a wasteful number, since it uses less digits than its factorization.

31388788891464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42189232421 (or 42189232417 counting only the distinct ones).

The product of its digits is 1783627776, while the sum is 78.

The spelling of 31388788891464 in words is "thirty-one trillion, three hundred eighty-eight billion, seven hundred eighty-eight million, eight hundred ninety-one thousand, four hundred sixty-four".