31250028 has 24 divisors (see below), whose sum is σ = 73343088. Its totient is φ = 10355776.

The previous prime is 31250017. The next prime is 31250039. The reversal of 31250028 is 82005213.

It is an interprime number because it is at equal distance from previous prime (31250017) and next prime (31250039).

It is a junction number, because it is equal to n+sod(n) for n = 31249986 and 31250013.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5451 + ... + 9602.

It is an arithmetic number, because the mean of its divisors is an integer number (3055962).

Almost surely, 2^31250028 is an apocalyptic number.

It is an amenable number.

31250028 is an abundant number, since it is smaller than the sum of its proper divisors (42093060).

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

31250028 is a wasteful number, since it uses less digits than its factorization.

31250028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15233 (or 15231 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 31250028 is about 5590.1724481450. The cubic root of 31250028 is about 314.9803565478.

The spelling of 31250028 in words is "thirty-one million, two hundred fifty thousand, twenty-eight".