725624 has 8 divisors (see below), whose sum is σ = 1360560. Its totient is φ = 362808.

The previous prime is 725603. The next prime is 725639. The reversal of 725624 is 426527.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 725593 and 725602.

It is a congruent number.

It is an unprimeable number.

725624 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 as a sum of consecutive naturals, namely, 45344 + ... + 45359.

It is an arithmetic number, because the mean of its divisors is an integer number (170070).

2⁷²⁵⁶²⁴ is an apocalyptic number.

It is an amenable number.

725624 is a deficient number, since it is larger than the sum of its proper divisors (634936).

725624 is a wasteful number, since it uses less digits than its factorization.

725624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90709 (or 90705 counting only the distinct ones).

The product of its digits is 3360, while the sum is 26.

The square root of 725624 is about 851.8356649026. The cubic root of 725624 is about 89.8608549436.

The spelling of 725624 in words is "seven hundred twenty-five thousand, six hundred twenty-four".