31272768 has 42 divisors (see below), whose sum is σ = 89639394. Its totient is φ = 10424064.

The previous prime is 31272763. The next prime is 31272779. The reversal of 31272768 is 86727213.

It can be written as a sum of positive squares in only one way, i.e., 31270464 + 2304 = 5592^2 + 48^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31272763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26571 + ... + 27722.

Almost surely, 2^31272768 is an apocalyptic number.

It is an amenable number.

31272768 is an abundant number, since it is smaller than the sum of its proper divisors (58366626).

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

31272768 is a wasteful number, since it uses less digits than its factorization.

31272768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54311 (or 54298 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 31272768 is about 5592.2060047892. The cubic root of 31272768 is about 315.0567395902.

The spelling of 31272768 in words is "thirty-one million, two hundred seventy-two thousand, seven hundred sixty-eight".