639164476 has 6 divisors (see below), whose sum is σ = 1118537840. Its totient is φ = 319582236.

The previous prime is 639164473. The next prime is 639164489. The reversal of 639164476 is 674461936.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639164473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79895556 + ... + 79895563.

Almost surely, 2^639164476 is an apocalyptic number.

It is an amenable number.

639164476 is a deficient number, since it is larger than the sum of its proper divisors (479373364).

639164476 is a wasteful number, since it uses less digits than its factorization.

639164476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159791123 (or 159791121 counting only the distinct ones).

The product of its digits is 653184, while the sum is 46.

The square root of 639164476 is about 25281.7023952107. The cubic root of 639164476 is about 861.3986956382.

The spelling of 639164476 in words is "six hundred thirty-nine million, one hundred sixty-four thousand, four hundred seventy-six".