620904816 has 120 divisors (see below), whose sum is σ = 1998622080. Its totient is φ = 176266368.

The previous prime is 620904811. The next prime is 620904841. The reversal of 620904816 is 618409026.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620904811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162415 + ... + 166193.

It is an arithmetic number, because the mean of its divisors is an integer number (16655184).

Almost surely, 2^620904816 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 620904816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999311040).

620904816 is an abundant number, since it is smaller than the sum of its proper divisors (1377717264).

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

620904816 is a wasteful number, since it uses less digits than its factorization.

620904816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3963 (or 3954 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 620904816 is about 24917.9617143939. The cubic root of 620904816 is about 853.1165022540.

The spelling of 620904816 in words is "six hundred twenty million, nine hundred four thousand, eight hundred sixteen".