620689655880 has 384 divisors, whose sum is σ = 2362577817600. Its totient is φ = 138364402176.

The previous prime is 620689655879. The next prime is 620689655891. The reversal of 620689655880 is 88556986026.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 78773781 + ... + 78781659.

It is an arithmetic number, because the mean of its divisors is an integer number (6152546400).

Almost surely, 2^620689655880 is an apocalyptic number.

620689655880 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 620689655880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1181288908800).

620689655880 is an abundant number, since it is smaller than the sum of its proper divisors (1741888161720).

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

620689655880 is a wasteful number, since it uses less digits than its factorization.

620689655880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8673 (or 8666 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 63.

The spelling of 620689655880 in words is "six hundred twenty billion, six hundred eighty-nine million, six hundred fifty-five thousand, eight hundred eighty".