639380450 has 48 divisors (see below), whose sum is σ = 1255098240. Its totient is φ = 241845120.

The previous prime is 639380449. The next prime is 639380491. The reversal of 639380450 is 54083936.

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, 99227 + ... + 105473.

It is an arithmetic number, because the mean of its divisors is an integer number (26147880).

Almost surely, 2^639380450 is an apocalyptic number.

639380450 is a deficient number, since it is larger than the sum of its proper divisors (615717790).

639380450 is a wasteful number, since it uses less digits than its factorization.

639380450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6371 (or 6366 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 639380450 is about 25285.9733844675. The cubic root of 639380450 is about 861.4957070640.

The spelling of 639380450 in words is "six hundred thirty-nine million, three hundred eighty thousand, four hundred fifty".