639149056 has 176 divisors, whose sum is σ = 1659871360. Its totient is φ = 239542272.

The previous prime is 639149023. The next prime is 639149083. The reversal of 639149056 is 650941936.

It is a super-2 number, since 2×639149056² = 817023031571382272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33639415 + ... + 33639433.

Almost surely, 2^639149056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639149056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829935680).

639149056 is an abundant number, since it is smaller than the sum of its proper divisors (1020722304).

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

639149056 is an equidigital number, since it uses as much as digits as its factorization.

639149056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 639149056 is about 25281.3974297308. The cubic root of 639149056 is about 861.3917684308.

The spelling of 639149056 in words is "six hundred thirty-nine million, one hundred forty-nine thousand, fifty-six".