31385128 has 16 divisors (see below), whose sum is σ = 62308980. Its totient is φ = 14769408.

The previous prime is 31385099. The next prime is 31385153. The reversal of 31385128 is 82158313.

It can be written as a sum of positive squares in 2 ways, for example, as 31337604 + 47524 = 5598^2 + 218^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31385128.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115251 + ... + 115522.

Almost surely, 2^31385128 is an apocalyptic number.

It is an amenable number.

31385128 is a deficient number, since it is larger than the sum of its proper divisors (30923852).

31385128 is a wasteful number, since it uses less digits than its factorization.

31385128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230796 (or 230792 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

The square root of 31385128 is about 5602.2431221788. The cubic root of 31385128 is about 315.4336112900.

It can be divided in two parts, 31385 and 128, that added together give a palindrome (31513).

The spelling of 31385128 in words is "thirty-one million, three hundred eighty-five thousand, one hundred twenty-eight".