31275028 has 12 divisors (see below), whose sum is σ = 55081012. Its totient is φ = 15537600.

The previous prime is 31274989. The next prime is 31275029. The reversal of 31275028 is 82057213.

It can be written as a sum of positive squares in 2 ways, for example, as 10316944 + 20958084 = 3212^2 + 4578^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31274987 and 31275005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31275029) 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, 24273 + ... + 25528.

Almost surely, 2^31275028 is an apocalyptic number.

It is an amenable number.

31275028 is a deficient number, since it is larger than the sum of its proper divisors (23805984).

31275028 is a wasteful number, since it uses less digits than its factorization.

31275028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49962 (or 49960 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 31275028 is about 5592.4080680866. The cubic root of 31275028 is about 315.0643288457.

The spelling of 31275028 in words is "thirty-one million, two hundred seventy-five thousand, twenty-eight".