31745740 has 24 divisors (see below), whose sum is σ = 71794800. Its totient is φ = 11721408.

The previous prime is 31745719. The next prime is 31745743. The reversal of 31745740 is 4754713.

It is not an unprimeable number, because it can be changed into a prime (31745743) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 60790 + ... + 61309.

It is an arithmetic number, because the mean of its divisors is an integer number (2991450).

Almost surely, 2^31745740 is an apocalyptic number.

It is an amenable number.

31745740 is an abundant number, since it is smaller than the sum of its proper divisors (40049060).

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

31745740 is a wasteful number, since it uses less digits than its factorization.

31745740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122121 (or 122119 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 31745740 is about 5634.3358082386. The cubic root of 31745740 is about 316.6371138934.

It can be divided in two parts, 317457 and 40, that multiplied together give a triangular number (12698280 = T₅₀₃₉).

The spelling of 31745740 in words is "thirty-one million, seven hundred forty-five thousand, seven hundred forty".