617920 has 28 divisors (see below), whose sum is σ = 1472184. Its totient is φ = 247040.

The previous prime is 617917. The next prime is 617951. The reversal of 617920 is 29716.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 646 + ... + 1285.

It is an arithmetic number, because the mean of its divisors is an integer number (52578).

2⁶¹⁷⁹²⁰ is an apocalyptic number.

It is an amenable number.

617920 is an abundant number, since it is smaller than the sum of its proper divisors (854264).

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

617920 is a wasteful number, since it uses less digits than its factorization.

617920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948 (or 1938 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 617920 is about 786.0788764494. The cubic root of 617920 is about 85.1747270878.

The spelling of 617920 in words is "six hundred seventeen thousand, nine hundred twenty".