639676284 has 24 divisors (see below), whose sum is σ = 1607392080. Its totient is φ = 196823424.

The previous prime is 639676283. The next prime is 639676291. The reversal of 639676284 is 482676936.

It is a happy number.

639676284 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639676283) 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, 2050089 + ... + 2050400.

It is an arithmetic number, because the mean of its divisors is an integer number (66974670).

Almost surely, 2^639676284 is an apocalyptic number.

It is an amenable number.

639676284 is an abundant number, since it is smaller than the sum of its proper divisors (967715796).

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

639676284 is a wasteful number, since it uses less digits than its factorization.

639676284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100509 (or 4100507 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 51.

The square root of 639676284 is about 25291.8224728864. The cubic root of 639676284 is about 861.6285546377.

The spelling of 639676284 in words is "six hundred thirty-nine million, six hundred seventy-six thousand, two hundred eighty-four".