621996439680 has 1536 divisors, whose sum is σ = 2910903091200. Its totient is φ = 118444032000.

The previous prime is 621996439679. The next prime is 621996439681. The reversal of 621996439680 is 86934699126.

621996439680 is a `hidden beast` number, since 6 + 2 + 199 + 6 + 439 + 6 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (621996439679) and next prime (621996439681).

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

It is not an unprimeable number, because it can be changed into a prime (621996439681) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 261232090 + ... + 261234470.

It is an arithmetic number, because the mean of its divisors is an integer number (1895119200).

Almost surely, 2^621996439680 is an apocalyptic number.

621996439680 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 621996439680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1455451545600).

621996439680 is an abundant number, since it is smaller than the sum of its proper divisors (2288906651520).

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

621996439680 is a wasteful number, since it uses less digits than its factorization.

621996439680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474 (or 2459 counting only the distinct ones).

The product of its (nonzero) digits is 30233088, while the sum is 63.

The spelling of 621996439680 in words is "six hundred twenty-one billion, nine hundred ninety-six million, four hundred thirty-nine thousand, six hundred eighty".