725660 has 24 divisors (see below), whose sum is σ = 1641696. Its totient is φ = 267840.

The previous prime is 725653. The next prime is 725663. The reversal of 725660 is 66527.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an Ulam 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 725660.

It is not an unprimeable number, because it can be changed into a prime (725663) by changing a digit.

725660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1136 + ... + 1655.

It is an arithmetic number, because the mean of its divisors is an integer number (68404).

2⁷²⁵⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

725660 is an abundant number, since it is smaller than the sum of its proper divisors (916036).

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

725660 is a wasteful number, since it uses less digits than its factorization.

725660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813 (or 2811 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 725660 is about 851.8567954768. The cubic root of 725660 is about 89.8623409921.

The spelling of 725660 in words is "seven hundred twenty-five thousand, six hundred sixty".