620655544790820 has 960 divisors, whose sum is σ = 2591203095613440. Its totient is φ = 120458756275200.

The previous prime is 620655544790803. The next prime is 620655544790821. The reversal of 620655544790820 is 28097445556026.

620655544790820 is a `hidden beast` number, since 6 + 2 + 0 + 6 + 5 + 5 + 544 + 7 + 9 + 0 + 82 + 0 = 666.

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 (620655544790821) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 166430082 + ... + 170118438.

It is an arithmetic number, because the mean of its divisors is an integer number (2699169891264).

Almost surely, 2^{620655544790820} is an apocalyptic number.

620655544790820 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 620655544790820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1295601547806720).

620655544790820 is an abundant number, since it is smaller than the sum of its proper divisors (1970547550822620).

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

620655544790820 is a wasteful number, since it uses less digits than its factorization.

620655544790820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3688486 (or 3688475 counting only the distinct ones).

The product of its (nonzero) digits is 145152000, while the sum is 63.

The spelling of 620655544790820 in words is "six hundred twenty trillion, six hundred fifty-five billion, five hundred forty-four million, seven hundred ninety thousand, eight hundred twenty".