31126628 has 24 divisors (see below), whose sum is σ = 60687480. Its totient is φ = 13870080.

The previous prime is 31126619. The next prime is 31126639. The reversal of 31126628 is 82662113.

It can be written as a sum of positive squares in 4 ways, for example, as 12544 + 31114084 = 112^2 + 5578^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 31126628.

It is a congruent number.

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, 8813 + ... + 11828.

It is an arithmetic number, because the mean of its divisors is an integer number (2528645).

Almost surely, 2^31126628 is an apocalyptic number.

It is an amenable number.

31126628 is a deficient number, since it is larger than the sum of its proper divisors (29560852).

31126628 is a wasteful number, since it uses less digits than its factorization.

31126628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20687 (or 20685 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 31126628 is about 5579.1243040463. The cubic root of 31126628 is about 314.5652118542.

The spelling of 31126628 in words is "thirty-one million, one hundred twenty-six thousand, six hundred twenty-eight".