31123028 has 6 divisors (see below), whose sum is σ = 54465306. Its totient is φ = 15561512.

The previous prime is 31123021. The next prime is 31123067. The reversal of 31123028 is 82032113.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 13162384 = 4238^2 + 3628^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3890375 + ... + 3890382.

It is an arithmetic number, because the mean of its divisors is an integer number (9077551).

Almost surely, 2^31123028 is an apocalyptic number.

It is an amenable number.

31123028 is a deficient number, since it is larger than the sum of its proper divisors (23342278).

31123028 is a wasteful number, since it uses less digits than its factorization.

31123028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7780761 (or 7780759 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 31123028 is about 5578.8016634399. The cubic root of 31123028 is about 314.5530842056.

The spelling of 31123028 in words is "thirty-one million, one hundred twenty-three thousand, twenty-eight".