640513006 has 12 divisors (see below), whose sum is σ = 1117630008. Its totient is φ = 274505532.

The previous prime is 640512997. The next prime is 640513061. The reversal of 640513006 is 600315046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3267826 + ... + 3268021.

It is an arithmetic number, because the mean of its divisors is an integer number (93135834).

Almost surely, 2^640513006 is an apocalyptic number.

640513006 is a deficient number, since it is larger than the sum of its proper divisors (477117002).

640513006 is a wasteful number, since it uses less digits than its factorization.

640513006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6535863 (or 6535856 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 640513006 is about 25308.3584216756. The cubic root of 640513006 is about 862.0040724179.

The spelling of 640513006 in words is "six hundred forty million, five hundred thirteen thousand, six".