31478457868 has 48 divisors (see below), whose sum is σ = 65537256960. Its totient is φ = 13040539200.

The previous prime is 31478457863. The next prime is 31478458021. The reversal of 31478457868 is 86875487413.

It is a super-2 number, since 2×31478457868² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31478457863) 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, 303118 + ... + 393493.

It is an arithmetic number, because the mean of its divisors is an integer number (1365359520).

Almost surely, 2^31478457868 is an apocalyptic number.

It is an amenable number.

31478457868 is an abundant number, since it is smaller than the sum of its proper divisors (34058799092).

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

31478457868 is a wasteful number, since it uses less digits than its factorization.

31478457868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696718 (or 696716 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 61.

The spelling of 31478457868 in words is "thirty-one billion, four hundred seventy-eight million, four hundred fifty-seven thousand, eight hundred sixty-eight".