620904 has 32 divisors (see below), whose sum is σ = 1592640. Its totient is φ = 201600.

The previous prime is 620887. The next prime is 620909. The reversal of 620904 is 409026.

620904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 620904.

It is not an unprimeable number, because it can be changed into a prime (620909) by changing a digit.

620904 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669 + ... + 1299.

It is an arithmetic number, because the mean of its divisors is an integer number (49770).

2⁶²⁰⁹⁰⁴ 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 620904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (796320).

620904 is an abundant number, since it is smaller than the sum of its proper divisors (971736).

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

620904 is a wasteful number, since it uses less digits than its factorization.

620904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 620904 is about 787.9746188806. The cubic root of 620904 is about 85.3116128529.

It can be divided in two parts, 6 and 20904, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 620904 in words is "six hundred twenty thousand, nine hundred four".