31478305668 has 12 divisors (see below), whose sum is σ = 73449379920. Its totient is φ = 10492768552.

The previous prime is 31478305633. The next prime is 31478305669. The reversal of 31478305668 is 86650387413.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 31478305668.

It is not an unprimeable number, because it can be changed into a prime (31478305669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1311596058 + ... + 1311596081.

It is an arithmetic number, because the mean of its divisors is an integer number (6120781660).

Almost surely, 2^31478305668 is an apocalyptic number.

It is an amenable number.

31478305668 is an abundant number, since it is smaller than the sum of its proper divisors (41971074252).

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

31478305668 is a wasteful number, since it uses less digits than its factorization.

31478305668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623192146 (or 2623192144 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 31478305668 in words is "thirty-one billion, four hundred seventy-eight million, three hundred five thousand, six hundred sixty-eight".