620984490 has 64 divisors (see below), whose sum is σ = 1713567744. Its totient is φ = 141081408.

The previous prime is 620984479. The next prime is 620984519. The reversal of 620984490 is 94489026.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26217 + ... + 43923.

It is an arithmetic number, because the mean of its divisors is an integer number (26774496).

Almost surely, 2^620984490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620984490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (856783872).

620984490 is an abundant number, since it is smaller than the sum of its proper divisors (1092583254).

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

620984490 is a wasteful number, since it uses less digits than its factorization.

620984490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17891.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 620984490 is about 24919.5603893809. The cubic root of 620984490 is about 853.1529910981.

The spelling of 620984490 in words is "six hundred twenty million, nine hundred eighty-four thousand, four hundred ninety".