31128036 has 12 divisors (see below), whose sum is σ = 72632112. Its totient is φ = 10376008.

The previous prime is 31128011. The next prime is 31128043. The reversal of 31128036 is 63082113.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 31127997 and 31128015.

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, 1296990 + ... + 1297013.

It is an arithmetic number, because the mean of its divisors is an integer number (6052676).

Almost surely, 2^31128036 is an apocalyptic number.

It is an amenable number.

31128036 is an abundant number, since it is smaller than the sum of its proper divisors (41504076).

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

31128036 is a wasteful number, since it uses less digits than its factorization.

31128036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594010 (or 2594008 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 31128036 is about 5579.2504872967. The cubic root of 31128036 is about 314.5699548580.

The spelling of 31128036 in words is "thirty-one million, one hundred twenty-eight thousand, thirty-six".