621494776980 has 432 divisors, whose sum is σ = 2480615190144. Its totient is φ = 122343851520.

The previous prime is 621494776979. The next prime is 621494776993. The reversal of 621494776980 is 89677494126.

621494776980 is a `hidden beast` number, since 6 + 2 + 1 + 494 + 7 + 7 + 69 + 80 = 666.

621494776980 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4941354 + ... + 5065566.

It is an arithmetic number, because the mean of its divisors is an integer number (5742164792).

Almost surely, 2^621494776980 is an apocalyptic number.

621494776980 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 621494776980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1240307595072).

621494776980 is an abundant number, since it is smaller than the sum of its proper divisors (1859120413164).

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

621494776980 is a wasteful number, since it uses less digits than its factorization.

621494776980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124284 (or 124260 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 63.

The spelling of 621494776980 in words is "six hundred twenty-one billion, four hundred ninety-four million, seven hundred seventy-six thousand, nine hundred eighty".