639045958 has 8 divisors (see below), whose sum is σ = 960149952. Its totient is φ = 318995976.

The previous prime is 639045947. The next prime is 639045977. The reversal of 639045958 is 859540936.

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

It is a super-2 number, since 2×639045958² = 816759472872275528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261985 + ... + 264412.

It is an arithmetic number, because the mean of its divisors is an integer number (120018744).

Almost surely, 2^639045958 is an apocalyptic number.

639045958 is a deficient number, since it is larger than the sum of its proper divisors (321103994).

639045958 is a wasteful number, since it uses less digits than its factorization.

639045958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527006.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 639045958 is about 25279.3583383756. The cubic root of 639045958 is about 861.3454503128.

The spelling of 639045958 in words is "six hundred thirty-nine million, forty-five thousand, nine hundred fifty-eight".