640692502 has 8 divisors (see below), whose sum is σ = 1011619800. Its totient is φ = 303485904.

The previous prime is 640692497. The next prime is 640692511. The reversal of 640692502 is 205296046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8430127 + ... + 8430202.

It is an arithmetic number, because the mean of its divisors is an integer number (126452475).

Almost surely, 2^640692502 is an apocalyptic number.

640692502 is a deficient number, since it is larger than the sum of its proper divisors (370927298).

640692502 is a wasteful number, since it uses less digits than its factorization.

640692502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16860350.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 640692502 is about 25311.9043534855. The cubic root of 640692502 is about 862.0845869588.

The spelling of 640692502 in words is "six hundred forty million, six hundred ninety-two thousand, five hundred two".