31520406428 has 12 divisors (see below), whose sum is σ = 63040812912. Its totient is φ = 13508745600.

The previous prime is 31520406427. The next prime is 31520406431. The reversal of 31520406428 is 82460402513.

31520406428 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31520406427) 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, 562864373 + ... + 562864428.

It is an arithmetic number, because the mean of its divisors is an integer number (5253401076).

Almost surely, 2^31520406428 is an apocalyptic number.

It is an amenable number.

31520406428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31520406428 is a wasteful number, since it uses less digits than its factorization.

31520406428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125728812 (or 1125728810 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 31520406428 in words is "thirty-one billion, five hundred twenty million, four hundred six thousand, four hundred twenty-eight".