639476452 has 24 divisors (see below), whose sum is σ = 1168626816. Its totient is φ = 305604288.

The previous prime is 639476417. The next prime is 639476459. The reversal of 639476452 is 254674936.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (639476459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228888 + ... + 231664.

It is an arithmetic number, because the mean of its divisors is an integer number (48692784).

Almost surely, 2^639476452 is an apocalyptic number.

It is an amenable number.

639476452 is a deficient number, since it is larger than the sum of its proper divisors (529150364).

639476452 is a wasteful number, since it uses less digits than its factorization.

639476452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5307 (or 5305 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 46.

The square root of 639476452 is about 25287.8716383961. The cubic root of 639476452 is about 861.5388223286.

The spelling of 639476452 in words is "six hundred thirty-nine million, four hundred seventy-six thousand, four hundred fifty-two".