31749072 has 20 divisors (see below), whose sum is σ = 82018560. Its totient is φ = 10583008.

The previous prime is 31749049. The next prime is 31749083. The reversal of 31749072 is 27094713.

It is a super-2 number, since 2×31749072² = 2016007145722368, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 330672 + ... + 330767.

It is an arithmetic number, because the mean of its divisors is an integer number (4100928).

Almost surely, 2^31749072 is an apocalyptic number.

It is an amenable number.

31749072 is an abundant number, since it is smaller than the sum of its proper divisors (50269488).

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

31749072 is a wasteful number, since it uses less digits than its factorization.

31749072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661450 (or 661444 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 31749072 is about 5634.6314875065. The cubic root of 31749072 is about 316.6481914737.

It can be divided in two parts, 3174 and 9072, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 31749072 in words is "thirty-one million, seven hundred forty-nine thousand, seventy-two".