31449640 has 16 divisors (see below), whose sum is σ = 70761780. Its totient is φ = 12579840.

The previous prime is 31449637. The next prime is 31449647. The reversal of 31449640 is 4694413.

It can be written as a sum of positive squares in 2 ways, for example, as 29181604 + 2268036 = 5402^2 + 1506^2 .

It is a super-2 number, since 2×31449640² = 1978159712259200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31449647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393081 + ... + 393160.

Almost surely, 2^31449640 is an apocalyptic number.

It is an amenable number.

31449640 is an abundant number, since it is smaller than the sum of its proper divisors (39312140).

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

31449640 is a wasteful number, since it uses less digits than its factorization.

31449640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786252 (or 786248 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 31449640 is about 5607.9978601993. The cubic root of 31449640 is about 315.6495875366.

The spelling of 31449640 in words is "thirty-one million, four hundred forty-nine thousand, six hundred forty".