639801799290 has 96 divisors (see below), whose sum is σ = 1811417212800. Its totient is φ = 156060535680.

The previous prime is 639801799267. The next prime is 639801799291. The reversal of 639801799290 is 92997108936.

It is a happy number.

639801799290 is a `hidden beast` number, since 6 + 398 + 0 + 1 + 79 + 92 + 90 = 666.

It is not an unprimeable number, because it can be changed into a prime (639801799291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6401326 + ... + 6500505.

It is an arithmetic number, because the mean of its divisors is an integer number (18868929300).

Almost surely, 2^639801799290 is an apocalyptic number.

639801799290 is an abundant number, since it is smaller than the sum of its proper divisors (1171615413510).

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

639801799290 is a wasteful number, since it uses less digits than its factorization.

639801799290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12901892 (or 12901889 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 63.

The spelling of 639801799290 in words is "six hundred thirty-nine billion, eight hundred one million, seven hundred ninety-nine thousand, two hundred ninety".