639969536624760 has 768 divisors, whose sum is σ = 2270340446400000. Its totient is φ = 155750829391872.

The previous prime is 639969536624581. The next prime is 639969536624779. The reversal of 639969536624760 is 67426635969936.

639969536624760 is a `hidden beast` number, since 6 + 3 + 9 + 9 + 6 + 9 + 5 + 366 + 247 + 6 + 0 = 666.

It is a super-2 number, since 2×639969536624760² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 639969536624760.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6411378372 + ... + 6411478188.

It is an arithmetic number, because the mean of its divisors is an integer number (2956172456250).

Almost surely, 2^{639969536624760} is an apocalyptic number.

639969536624760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639969536624760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1135170223200000).

639969536624760 is an abundant number, since it is smaller than the sum of its proper divisors (1630370909775240).

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

639969536624760 is a wasteful number, since it uses less digits than its factorization.

639969536624760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100168 (or 100161 counting only the distinct ones).

The product of its (nonzero) digits is 14285134080, while the sum is 81.

The spelling of 639969536624760 in words is "six hundred thirty-nine trillion, nine hundred sixty-nine billion, five hundred thirty-six million, six hundred twenty-four thousand, seven hundred sixty".