31628625 has 32 divisors (see below), whose sum is σ = 60153600. Its totient is φ = 14457600.

The previous prime is 31628617. The next prime is 31628627. The reversal of 31628625 is 52682613.

It is not a de Polignac number, because 31628625 - 2³ = 31628617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31628627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3400 + ... + 8649.

It is an arithmetic number, because the mean of its divisors is an integer number (1879800).

Almost surely, 2^31628625 is an apocalyptic number.

31628625 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31628625 is a deficient number, since it is larger than the sum of its proper divisors (28524975).

31628625 is a wasteful number, since it uses less digits than its factorization.

31628625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12074 (or 12064 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 31628625 is about 5623.9332321783. The cubic root of 31628625 is about 316.2472594762.

The spelling of 31628625 in words is "thirty-one million, six hundred twenty-eight thousand, six hundred twenty-five".