31347386478 has 16 divisors (see below), whose sum is σ = 69660858960. Its totient is φ = 10449128808.

The previous prime is 31347386429. The next prime is 31347386549. The reversal of 31347386478 is 87468374313.

31347386478 is a `hidden beast` number, since 3 + 134 + 7 + 38 + 6 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 580507157 = 31347386478 / (3 + 1 + 3 + 4 + 7 + 3 + 8 + 6 + 4 + 7 + 8).

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, 290253525 + ... + 290253632.

It is an arithmetic number, because the mean of its divisors is an integer number (4353803685).

Almost surely, 2^31347386478 is an apocalyptic number.

31347386478 is an abundant number, since it is smaller than the sum of its proper divisors (38313472482).

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

31347386478 is a wasteful number, since it uses less digits than its factorization.

31347386478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580507168 (or 580507162 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 54.

The spelling of 31347386478 in words is "thirty-one billion, three hundred forty-seven million, three hundred eighty-six thousand, four hundred seventy-eight".