621349807680 has 840 divisors, whose sum is σ = 2581739719416. Its totient is φ = 141436108800.

The previous prime is 621349807619. The next prime is 621349807691. The reversal of 621349807680 is 86708943126.

621349807680 is a `hidden beast` number, since 6 + 2 + 1 + 3 + 498 + 0 + 76 + 80 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 796594176 + 620553213504 = 28224^2 + 787752^2 .

It is a tau number, because it is divible by the number of its divisors (840).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 356891610 + ... + 356893350.

Almost surely, 2^621349807680 is an apocalyptic number.

621349807680 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 621349807680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1290869859708).

621349807680 is an abundant number, since it is smaller than the sum of its proper divisors (1960389911736).

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

621349807680 is a wasteful number, since it uses less digits than its factorization.

621349807680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2065 (or 2039 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 621349807680 in words is "six hundred twenty-one billion, three hundred forty-nine million, eight hundred seven thousand, six hundred eighty".