625809 has 8 divisors (see below), whose sum is σ = 838240. Its totient is φ = 415296.

The previous prime is 625789. The next prime is 625811. The reversal of 625809 is 908526.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 625809 - 2⁵ = 625777 is a prime.

It is a Duffinian number.

625809 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 625809.

It is not an unprimeable number, because it can be changed into a prime (625819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 702 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (104780).

2⁶²⁵⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

625809 is a deficient number, since it is larger than the sum of its proper divisors (212431).

625809 is a wasteful number, since it uses less digits than its factorization.

625809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 625809 is about 791.0809061025. The cubic root of 625809 is about 85.5356713096.

The spelling of 625809 in words is "six hundred twenty-five thousand, eight hundred nine".