40640504 has 64 divisors (see below), whose sum is σ = 83466240. Its totient is φ = 18506880.

The previous prime is 40640497. The next prime is 40640507. The reversal of 40640504 is 40504604.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 40640504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40640507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394517 + ... + 394619.

It is an arithmetic number, because the mean of its divisors is an integer number (1304160).

Almost surely, 2^40640504 is an apocalyptic number.

It is an amenable number.

40640504 is an abundant number, since it is smaller than the sum of its proper divisors (42825736).

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

40640504 is a wasteful number, since it uses less digits than its factorization.

40640504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 40640504 is about 6374.9905097969. The cubic root of 40640504 is about 343.8109426275.

The spelling of 40640504 in words is "forty million, six hundred forty thousand, five hundred four".