720625 has 10 divisors (see below), whose sum is σ = 901274. Its totient is φ = 576000.

The previous prime is 720619. The next prime is 720653. The reversal of 720625 is 526027.

It can be written as a sum of positive squares in 5 ways, for example, as 178929 + 541696 = 423^2 + 736^2 .

It is not a de Polignac number, because 720625 - 2³ = 720617 is a prime.

It is a Duffinian number.

720625 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 720596 and 720605.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 49 + ... + 1201.

2⁷²⁰⁶²⁵ is an apocalyptic number.

It is an amenable number.

720625 is a deficient number, since it is larger than the sum of its proper divisors (180649).

720625 is an equidigital number, since it uses as much as digits as its factorization.

720625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 720625 is about 848.8963423175. The cubic root of 720625 is about 89.6540214859.

The spelling of 720625 in words is "seven hundred twenty thousand, six hundred twenty-five".