31045128 has 32 divisors (see below), whose sum is σ = 82179360. Its totient is φ = 9739520.

The previous prime is 31045117. The next prime is 31045129. The reversal of 31045128 is 82154013.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 31045098 and 31045107.

It is not an unprimeable number, because it can be changed into a prime (31045129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37638 + ... + 38453.

It is an arithmetic number, because the mean of its divisors is an integer number (2568105).

Almost surely, 2^31045128 is an apocalyptic number.

It is an amenable number.

31045128 is an abundant number, since it is smaller than the sum of its proper divisors (51134232).

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

31045128 is a wasteful number, since it uses less digits than its factorization.

31045128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76117 (or 76113 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 31045128 is about 5571.8155030475. The cubic root of 31045128 is about 314.2904259821.

The spelling of 31045128 in words is "thirty-one million, forty-five thousand, one hundred twenty-eight".