617720 has 16 divisors (see below), whose sum is σ = 1389960. Its totient is φ = 247072.

The previous prime is 617719. The next prime is 617723. The reversal of 617720 is 27716.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 617720.

It is not an unprimeable number, because it can be changed into a prime (617723) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 7682 + ... + 7761.

2⁶¹⁷⁷²⁰ is an apocalyptic number.

It is an amenable number.

617720 is an abundant number, since it is smaller than the sum of its proper divisors (772240).

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

617720 is a wasteful number, since it uses less digits than its factorization.

617720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15454 (or 15450 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 617720 is about 785.9516524571. The cubic root of 617720 is about 85.1655366945.

The spelling of 617720 in words is "six hundred seventeen thousand, seven hundred twenty".