640314066 has 48 divisors (see below), whose sum is σ = 1554496704. Its totient is φ = 174990816.

The previous prime is 640314049. The next prime is 640314071. The reversal of 640314066 is 660413046.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40585 + ... + 54108.

It is an arithmetic number, because the mean of its divisors is an integer number (32385348).

Almost surely, 2^640314066 is an apocalyptic number.

640314066 is an abundant number, since it is smaller than the sum of its proper divisors (914182638).

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

640314066 is a wasteful number, since it uses less digits than its factorization.

640314066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94735 (or 94728 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 640314066 is about 25304.4277943604. The cubic root of 640314066 is about 861.9148185199.

The spelling of 640314066 in words is "six hundred forty million, three hundred fourteen thousand, sixty-six".