640502662 has 4 divisors (see below), whose sum is σ = 960753996. Its totient is φ = 320251330.

The previous prime is 640502609. The next prime is 640502677. The reversal of 640502662 is 266205046.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160125664 + ... + 160125667.

It is an arithmetic number, because the mean of its divisors is an integer number (240188499).

Almost surely, 2^640502662 is an apocalyptic number.

640502662 is a deficient number, since it is larger than the sum of its proper divisors (320251334).

640502662 is a wasteful number, since it uses less digits than its factorization.

640502662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320251333.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 640502662 is about 25308.1540614878. The cubic root of 640502662 is about 861.9994320656. Note that the first 3 decimals are identical.

The spelling of 640502662 in words is "six hundred forty million, five hundred two thousand, six hundred sixty-two".