31228764 has 48 divisors (see below), whose sum is σ = 83586048. Its totient is φ = 8889408.

The previous prime is 31228741. The next prime is 31228781. The reversal of 31228764 is 46782213.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 30322 + ... + 31334.

It is an arithmetic number, because the mean of its divisors is an integer number (1741376).

Almost surely, 2^31228764 is an apocalyptic number.

It is an amenable number.

31228764 is an abundant number, since it is smaller than the sum of its proper divisors (52357284).

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

31228764 is a wasteful number, since it uses less digits than its factorization.

31228764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394 (or 1392 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 31228764 is about 5588.2702153708. The cubic root of 31228764 is about 314.9088978168.

The spelling of 31228764 in words is "thirty-one million, two hundred twenty-eight thousand, seven hundred sixty-four".