31344664 has 32 divisors (see below), whose sum is σ = 64844640. Its totient is φ = 14112000.

The previous prime is 31344631. The next prime is 31344671. The reversal of 31344664 is 46644313.

31344664 = T₄₀ + T₄₁ + ... + T₅₇₂.

It is a happy number.

It is a super-2 number, since 2×31344664² = 1964975922545792, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589 + ... + 7939.

It is an arithmetic number, because the mean of its divisors is an integer number (2026395).

Almost surely, 2^31344664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31344664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32422320).

31344664 is an abundant number, since it is smaller than the sum of its proper divisors (33499976).

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

31344664 is a wasteful number, since it uses less digits than its factorization.

31344664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7411 (or 7407 counting only the distinct ones).

The product of its digits is 20736, while the sum is 31.

The square root of 31344664 is about 5598.6305468391. The cubic root of 31344664 is about 315.2979929713.

Adding to 31344664 its reverse (46644313), we get a palindrome (77988977).

The spelling of 31344664 in words is "thirty-one million, three hundred forty-four thousand, six hundred sixty-four".