639875850 has 48 divisors (see below), whose sum is σ = 1590835680. Its totient is φ = 170209600.

The previous prime is 639875843. The next prime is 639875851. The reversal of 639875850 is 58578936.

It is a super-2 number, since 2×639875850² = 818882206826445000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 639875793 and 639875802.

It is not an unprimeable number, because it can be changed into a prime (639875851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57760 + ... + 67940.

It is an arithmetic number, because the mean of its divisors is an integer number (33142410).

Almost surely, 2^639875850 is an apocalyptic number.

639875850 is an abundant number, since it is smaller than the sum of its proper divisors (950959830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639875850 is a wasteful number, since it uses less digits than its factorization.

639875850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615 (or 10610 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 51.

The square root of 639875850 is about 25295.7674325172. The cubic root of 639875850 is about 861.7181488536.

The spelling of 639875850 in words is "six hundred thirty-nine million, eight hundred seventy-five thousand, eight hundred fifty".