31238628 has 12 divisors (see below), whose sum is σ = 72890160. Its totient is φ = 10412872.

The previous prime is 31238617. The next prime is 31238633. The reversal of 31238628 is 82683213.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1301598 + ... + 1301621.

It is an arithmetic number, because the mean of its divisors is an integer number (6074180).

Almost surely, 2^31238628 is an apocalyptic number.

It is an amenable number.

31238628 is an abundant number, since it is smaller than the sum of its proper divisors (41651532).

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

31238628 is a wasteful number, since it uses less digits than its factorization.

31238628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2603226 (or 2603224 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 31238628 is about 5589.1527085955. The cubic root of 31238628 is about 314.9420503123.

The spelling of 31238628 in words is "thirty-one million, two hundred thirty-eight thousand, six hundred twenty-eight".