620764 has 6 divisors (see below), whose sum is σ = 1086344. Its totient is φ = 310380.

The previous prime is 620759. The next prime is 620771. The reversal of 620764 is 467026.

It is a congruent number.

It is an unprimeable number.

620764 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77592 + ... + 77599.

2⁶²⁰⁷⁶⁴ is an apocalyptic number.

It is an amenable number.

620764 is a deficient number, since it is larger than the sum of its proper divisors (465580).

620764 is a wasteful number, since it uses less digits than its factorization.

620764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155195 (or 155193 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 620764 is about 787.8857785238. The cubic root of 620764 is about 85.3052004158.

The spelling of 620764 in words is "six hundred twenty thousand, seven hundred sixty-four".