620988984 has 128 divisors (see below), whose sum is σ = 2150668800. Its totient is φ = 161291520.

The previous prime is 620988959. The next prime is 620988997. The reversal of 620988984 is 489889026.

620988984 is a `hidden beast` number, since 620 + 9 + 8 + 8 + 9 + 8 + 4 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 620988984.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2037 + ... + 35300.

It is an arithmetic number, because the mean of its divisors is an integer number (16802100).

Almost surely, 2^620988984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620988984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1075334400).

620988984 is an abundant number, since it is smaller than the sum of its proper divisors (1529679816).

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

620988984 is a wasteful number, since it uses less digits than its factorization.

620988984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37370 (or 37360 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The square root of 620988984 is about 24919.6505593477. The cubic root of 620988984 is about 853.1550491529.

The spelling of 620988984 in words is "six hundred twenty million, nine hundred eighty-eight thousand, nine hundred eighty-four".