639296942980 has 96 divisors (see below), whose sum is σ = 1407533137920. Its totient is φ = 243443882880.

The previous prime is 639296942971. The next prime is 639296942989. The reversal of 639296942980 is 89249692936.

It is an interprime number because it is at equal distance from previous prime (639296942971) and next prime (639296942989).

It is not an unprimeable number, because it can be changed into a prime (639296942989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105718317 + ... + 105724363.

It is an arithmetic number, because the mean of its divisors is an integer number (14661803520).

Almost surely, 2^639296942980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639296942980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703766568960).

639296942980 is an abundant number, since it is smaller than the sum of its proper divisors (768236194940).

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

639296942980 is a wasteful number, since it uses less digits than its factorization.

639296942980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7129 (or 7127 counting only the distinct ones).

The product of its (nonzero) digits is 90699264, while the sum is 67.

The spelling of 639296942980 in words is "six hundred thirty-nine billion, two hundred ninety-six million, nine hundred forty-two thousand, nine hundred eighty".