639550814 has 8 divisors (see below), whose sum is σ = 1096372848. Its totient is φ = 274093200.

The previous prime is 639550789. The next prime is 639550817. The reversal of 639550814 is 418055936.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639550817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22841087 + ... + 22841114.

It is an arithmetic number, because the mean of its divisors is an integer number (137046606).

Almost surely, 2^639550814 is an apocalyptic number.

639550814 is a deficient number, since it is larger than the sum of its proper divisors (456822034).

639550814 is a wasteful number, since it uses less digits than its factorization.

639550814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45682210.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 639550814 is about 25289.3419052375. The cubic root of 639550814 is about 861.5722159308.

The spelling of 639550814 in words is "six hundred thirty-nine million, five hundred fifty thousand, eight hundred fourteen".