620640558720 has 2560 divisors, whose sum is σ = 2955918873600. Its totient is φ = 120394874880.

The previous prime is 620640558701. The next prime is 620640558731. The reversal of 620640558720 is 27855046026.

620640558720 is a `hidden beast` number, since 6 + 2 + 0 + 6 + 40 + 5 + 587 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 5693950026 + ... + 5693950134.

It is an arithmetic number, because the mean of its divisors is an integer number (1154655810).

Almost surely, 2^620640558720 is an apocalyptic number.

620640558720 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 620640558720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1477959436800).

620640558720 is an abundant number, since it is smaller than the sum of its proper divisors (2335278314880).

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

620640558720 is a wasteful number, since it uses less digits than its factorization.

620640558720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 620640558720 in words is "six hundred twenty billion, six hundred forty million, five hundred fifty-eight thousand, seven hundred twenty".