640322966 has 16 divisors (see below), whose sum is σ = 977303040. Its totient is φ = 314594280.

The previous prime is 640322959. The next prime is 640323001. The reversal of 640322966 is 669223046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23735 + ... + 42941.

It is an arithmetic number, because the mean of its divisors is an integer number (61081440).

Almost surely, 2^640322966 is an apocalyptic number.

640322966 is a deficient number, since it is larger than the sum of its proper divisors (336980074).

640322966 is a wasteful number, since it uses less digits than its factorization.

640322966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19499.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 640322966 is about 25304.6036523001. The cubic root of 640322966 is about 861.9188118761.

The spelling of 640322966 in words is "six hundred forty million, three hundred twenty-two thousand, nine hundred sixty-six".