621087136768 has 352 divisors, whose sum is σ = 1553272770560. Its totient is φ = 242223022080.

The previous prime is 621087136727. The next prime is 621087136841. The reversal of 621087136768 is 867631780126.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 662845996 + ... + 662846932.

Almost surely, 2^621087136768 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 621087136768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (776636385280).

621087136768 is an abundant number, since it is smaller than the sum of its proper divisors (932185633792).

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

621087136768 is a wasteful number, since it uses less digits than its factorization.

621087136768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 621087136768 in words is "six hundred twenty-one billion, eighty-seven million, one hundred thirty-six thousand, seven hundred sixty-eight".