639784574 has 16 divisors (see below), whose sum is σ = 1127453040. Its totient is φ = 268440960.

The previous prime is 639784553. The next prime is 639784619. The reversal of 639784574 is 475487936.

639784574 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×639784574² = 818648602256722952, 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 7 ways as a sum of consecutive naturals, for example, 1118219 + ... + 1118790.

It is an arithmetic number, because the mean of its divisors is an integer number (70465815).

Almost surely, 2^639784574 is an apocalyptic number.

639784574 is a deficient number, since it is larger than the sum of its proper divisors (487668466).

639784574 is a wasteful number, since it uses less digits than its factorization.

639784574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237035.

The product of its digits is 5080320, while the sum is 53.

The square root of 639784574 is about 25293.9631928253. The cubic root of 639784574 is about 861.6771732352.

The spelling of 639784574 in words is "six hundred thirty-nine million, seven hundred eighty-four thousand, five hundred seventy-four".