639803574 has 48 divisors (see below), whose sum is σ = 1425048768. Its totient is φ = 207357696.

The previous prime is 639803533. The next prime is 639803603. The reversal of 639803574 is 475308936.

639803574 is a `hidden beast` number, since 639 + 8 + 0 + 3 + 5 + 7 + 4 = 666.

It is a super-2 number, since 2×639803574² = 818697226606346952, 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 23 ways as a sum of consecutive naturals, for example, 130414 + ... + 135230.

It is an arithmetic number, because the mean of its divisors is an integer number (29688516).

Almost surely, 2^639803574 is an apocalyptic number.

639803574 is an abundant number, since it is smaller than the sum of its proper divisors (785245194).

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

639803574 is a wasteful number, since it uses less digits than its factorization.

639803574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5029 (or 5026 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 639803574 is about 25294.3387737256. The cubic root of 639803574 is about 861.6857030357.

The spelling of 639803574 in words is "six hundred thirty-nine million, eight hundred three thousand, five hundred seventy-four".