31506868 has 6 divisors (see below), whose sum is σ = 55137026. Its totient is φ = 15753432.

The previous prime is 31506841. The next prime is 31506887. The reversal of 31506868 is 86860513.

It can be written as a sum of positive squares in only one way, i.e., 31047184 + 459684 = 5572^2 + 678^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3938355 + ... + 3938362.

Almost surely, 2^31506868 is an apocalyptic number.

It is an amenable number.

31506868 is a deficient number, since it is larger than the sum of its proper divisors (23630158).

31506868 is a wasteful number, since it uses less digits than its factorization.

31506868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7876721 (or 7876719 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 31506868 is about 5613.0978968837. The cubic root of 31506868 is about 315.8409309967.

The spelling of 31506868 in words is "thirty-one million, five hundred six thousand, eight hundred sixty-eight".