31628565440 has 56 divisors (see below), whose sum is σ = 75337324560. Its totient is φ = 12647763968.

The previous prime is 31628565421. The next prime is 31628565443. The reversal of 31628565440 is 4456582613.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 31628565391 and 31628565400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31628565443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1273784 + ... + 1298376.

Almost surely, 2^31628565440 is an apocalyptic number.

It is an amenable number.

31628565440 is an abundant number, since it is smaller than the sum of its proper divisors (43708759120).

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

31628565440 is a wasteful number, since it uses less digits than its factorization.

31628565440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28629 (or 28619 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 31628565440 in words is "thirty-one billion, six hundred twenty-eight million, five hundred sixty-five thousand, four hundred forty".