31322664 has 24 divisors (see below), whose sum is σ = 84832410. Its totient is φ = 10440864.

The previous prime is 31322657. The next prime is 31322671. The reversal of 31322664 is 46622313.

It is an interprime number because it is at equal distance from previous prime (31322657) and next prime (31322671).

It can be written as a sum of positive squares in only one way, i.e., 20629764 + 10692900 = 4542^2 + 3270^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×31322664² = 1962218560113792, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 217447 + ... + 217590.

Almost surely, 2^31322664 is an apocalyptic number.

It is an amenable number.

31322664 is an abundant number, since it is smaller than the sum of its proper divisors (53509746).

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

31322664 is a wasteful number, since it uses less digits than its factorization.

31322664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435049 (or 435042 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 31322664 is about 5596.6654357751. The cubic root of 31322664 is about 315.2242092342.

Adding to 31322664 its reverse (46622313), we get a palindrome (77944977).

The spelling of 31322664 in words is "thirty-one million, three hundred twenty-two thousand, six hundred sixty-four".