31643444 has 12 divisors (see below), whose sum is σ = 63286944. Its totient is φ = 13561464.

The previous prime is 31643429. The next prime is 31643461. The reversal of 31643444 is 44434613.

31643444 is an admirable number.

It is a super-2 number, since 2×31643444² = 2002615096362272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565034 + ... + 565089.

It is an arithmetic number, because the mean of its divisors is an integer number (5273912).

Almost surely, 2^31643444 is an apocalyptic number.

It is an amenable number.

31643444 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31643444 is a wasteful number, since it uses less digits than its factorization.

31643444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130134 (or 1130132 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

The square root of 31643444 is about 5625.2505721968. The cubic root of 31643444 is about 316.2966423418.

The spelling of 31643444 in words is "thirty-one million, six hundred forty-three thousand, four hundred forty-four".