639720989027936 has 24 divisors (see below), whose sum is σ = 1333536032276280. Its totient is φ = 301045171307008.

The previous prime is 639720989027837. The next prime is 639720989027983.

639720989027936 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×639720989027936² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587978849666 + ... + 587978850753.

It is an arithmetic number, because the mean of its divisors is an integer number (55564001344845).

Almost surely, 2^{639720989027936} is an apocalyptic number.

It is an amenable number.

639720989027936 is an abundant number, since it is smaller than the sum of its proper divisors (693815043248344).

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

639720989027936 is a wasteful number, since it uses less digits than its factorization.

639720989027936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175957700446 (or 1175957700438 counting only the distinct ones).

The product of its (nonzero) digits is 3333197952, while the sum is 80.

The spelling of 639720989027936 in words is "six hundred thirty-nine trillion, seven hundred twenty billion, nine hundred eighty-nine million, twenty-seven thousand, nine hundred thirty-six".