620784 has 50 divisors (see below), whose sum is σ = 1800480. Its totient is φ = 206496.

The previous prime is 620777. The next prime is 620813. The reversal of 620784 is 487026.

620784 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

620784 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 9 ways as a sum of consecutive naturals, for example, 1057 + ... + 1535.

2⁶²⁰⁷⁸⁴ 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 620784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900240).

620784 is an abundant number, since it is smaller than the sum of its proper divisors (1179696).

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

620784 is a wasteful number, since it uses less digits than its factorization.

620784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 620784 is about 787.8984706166. The cubic root of 620784 is about 85.3061165372.

The spelling of 620784 in words is "six hundred twenty thousand, seven hundred eighty-four".