620789 has 12 divisors (see below), whose sum is σ = 721476. Its totient is φ = 529152.

The previous prime is 620777. The next prime is 620813. The reversal of 620789 is 987026.

It can be written as a sum of positive squares in 6 ways, for example, as 20164 + 600625 = 142^2 + 775^2 .

It is not a de Polignac number, because 620789 - 2⁴ = 620773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620759) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11687 + ... + 11739.

It is an arithmetic number, because the mean of its divisors is an integer number (60123).

2⁶²⁰⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

620789 is a deficient number, since it is larger than the sum of its proper divisors (100687).

620789 is a wasteful number, since it uses less digits than its factorization.

620789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 620789 is about 787.9016436079. The cubic root of 620789 is about 85.3063455645.

The spelling of 620789 in words is "six hundred twenty thousand, seven hundred eighty-nine".