639369788 has 6 divisors (see below), whose sum is σ = 1118897136. Its totient is φ = 319684892.

The previous prime is 639369781. The next prime is 639369791. The reversal of 639369788 is 887963936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639369781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79921220 + ... + 79921227.

It is an arithmetic number, because the mean of its divisors is an integer number (186482856).

Almost surely, 2^639369788 is an apocalyptic number.

It is an amenable number.

639369788 is a deficient number, since it is larger than the sum of its proper divisors (479527348).

639369788 is a wasteful number, since it uses less digits than its factorization.

639369788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159842451 (or 159842449 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 59.

The square root of 639369788 is about 25285.7625552404. The cubic root of 639369788 is about 861.4909184084.

The spelling of 639369788 in words is "six hundred thirty-nine million, three hundred sixty-nine thousand, seven hundred eighty-eight".