620644544 has 84 divisors (see below), whose sum is σ = 1375190544. Its totient is φ = 276261888.

The previous prime is 620644523. The next prime is 620644553. The reversal of 620644544 is 445446026.

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 11 ways as a sum of consecutive naturals, for example, 699269 + ... + 700155.

It is an arithmetic number, because the mean of its divisors is an integer number (16371316).

Almost surely, 2^620644544 is an apocalyptic number.

620644544 is a gapful number since it is divisible by the number (64) 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 620644544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (687595272).

620644544 is an abundant number, since it is smaller than the sum of its proper divisors (754546000).

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

620644544 is a wasteful number, since it uses less digits than its factorization.

620644544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970 (or 931 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

The square root of 620644544 is about 24912.7385889227. The cubic root of 620644544 is about 852.9972819564.

The spelling of 620644544 in words is "six hundred twenty million, six hundred forty-four thousand, five hundred forty-four".