639937626739936 has 72 divisors (see below), whose sum is σ = 1454256850470480. Its totient is φ = 271543546444800.

The previous prime is 639937626739871. The next prime is 639937626739937.

639937626739936 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×639937626739936² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639937626739937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137743621 + ... + 142313668.

It is an arithmetic number, because the mean of its divisors is an integer number (20198011812090).

Almost surely, 2^{639937626739936} is an apocalyptic number.

It is an amenable number.

639937626739936 is an abundant number, since it is smaller than the sum of its proper divisors (814319223730544).

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

639937626739936 is a wasteful number, since it uses less digits than its factorization.

639937626739936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280057508 (or 280057399 counting only the distinct ones).

The product of its digits is 67497258528, while the sum is 88.

The spelling of 639937626739936 in words is "six hundred thirty-nine trillion, nine hundred thirty-seven billion, six hundred twenty-six million, seven hundred thirty-nine thousand, nine hundred thirty-six".