639169082 has 16 divisors (see below), whose sum is σ = 1028259360. Its totient is φ = 297050832.

The previous prime is 639169039. The next prime is 639169099. The reversal of 639169082 is 280961936.

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, 156668 + ... + 160695.

It is an arithmetic number, because the mean of its divisors is an integer number (64266210).

Almost surely, 2^639169082 is an apocalyptic number.

639169082 is a deficient number, since it is larger than the sum of its proper divisors (389090278).

639169082 is a wasteful number, since it uses less digits than its factorization.

639169082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317437.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 639169082 is about 25281.7934885957. The cubic root of 639169082 is about 861.4007647941.

The spelling of 639169082 in words is "six hundred thirty-nine million, one hundred sixty-nine thousand, eighty-two".