31233128 has 8 divisors (see below), whose sum is σ = 58562130. Its totient is φ = 15616560.

The previous prime is 31233121. The next prime is 31233221. The reversal of 31233128 is 82133213.

It can be written as a sum of positive squares in only one way, i.e., 28536964 + 2696164 = 5342^2 + 1642^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (31233121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1952063 + ... + 1952078.

Almost surely, 2^31233128 is an apocalyptic number.

It is an amenable number.

31233128 is a deficient number, since it is larger than the sum of its proper divisors (27329002).

31233128 is a wasteful number, since it uses less digits than its factorization.

31233128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3904147 (or 3904143 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 31233128 is about 5588.6606624486. The cubic root of 31233128 is about 314.9235659010.

The spelling of 31233128 in words is "thirty-one million, two hundred thirty-three thousand, one hundred twenty-eight".