640044060 has 48 divisors (see below), whose sum is σ = 1809540096. Its totient is φ = 169019712.

The previous prime is 640044047. The next prime is 640044077. The reversal of 640044060 is 60440046.

It is a self number, because there is not a number n which added to its sum of digits gives 640044060.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45604 + ... + 57963.

It is an arithmetic number, because the mean of its divisors is an integer number (37698752).

Almost surely, 2^640044060 is an apocalyptic number.

640044060 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640044060 is an abundant number, since it is smaller than the sum of its proper divisors (1169496036).

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

640044060 is a wasteful number, since it uses less digits than its factorization.

640044060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103682 (or 103680 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 640044060 is about 25299.0920785707. The cubic root of 640044060 is about 861.7936514740.

The spelling of 640044060 in words is "six hundred forty million, forty-four thousand, sixty".