40531664 has 20 divisors (see below), whose sum is σ = 78773604. Its totient is φ = 20203008.

The previous prime is 40531619. The next prime is 40531691. The reversal of 40531664 is 46613504.

It is a happy number.

40531664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 26091664 + 14440000 = 5108^2 + 3800^2 .

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, 1634 + ... + 9150.

Almost surely, 2^40531664 is an apocalyptic number.

It is an amenable number.

40531664 is a deficient number, since it is larger than the sum of its proper divisors (38241940).

40531664 is a wasteful number, since it uses less digits than its factorization.

40531664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7862 (or 7856 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 40531664 is about 6366.4483034106. The cubic root of 40531664 is about 343.5037463210.

The spelling of 40531664 in words is "forty million, five hundred thirty-one thousand, six hundred sixty-four".