31528625 has 32 divisors (see below), whose sum is σ = 42895008. Its totient is φ = 23040000.

The previous prime is 31528621. The next prime is 31528633. The reversal of 31528625 is 52682513.

It can be written as a sum of positive squares in 16 ways, for example, as 2411809 + 29116816 = 1553^2 + 5396^2 .

It is not a de Polignac number, because 31528625 - 2² = 31528621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31528591 and 31528600.

It is not an unprimeable number, because it can be changed into a prime (31528621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78425 + ... + 78825.

It is an arithmetic number, because the mean of its divisors is an integer number (1340469).

Almost surely, 2^31528625 is an apocalyptic number.

It is an amenable number.

31528625 is a deficient number, since it is larger than the sum of its proper divisors (11366383).

31528625 is a wasteful number, since it uses less digits than its factorization.

31528625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 460 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 31528625 is about 5615.0356187650. The cubic root of 31528625 is about 315.9136153607.

The spelling of 31528625 in words is "thirty-one million, five hundred twenty-eight thousand, six hundred twenty-five".