720609425 has 12 divisors (see below), whose sum is σ = 895632780. Its totient is φ = 575147520.

The previous prime is 720609401. The next prime is 720609443. The reversal of 720609425 is 524906027.

It can be written as a sum of positive squares in 6 ways, for example, as 267387904 + 453221521 = 16352^2 + 21289^2 .

It is not a de Polignac number, because 720609425 - 2⁶ = 720609361 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22460 + ... + 44109.

It is an arithmetic number, because the mean of its divisors is an integer number (74636065).

Almost surely, 2^720609425 is an apocalyptic number.

It is an amenable number.

720609425 is a deficient number, since it is larger than the sum of its proper divisors (175023355).

720609425 is a wasteful number, since it uses less digits than its factorization.

720609425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67012 (or 67007 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 720609425 is about 26844.1692924180. The cubic root of 720609425 is about 896.5337557836.

The spelling of 720609425 in words is "seven hundred twenty million, six hundred nine thousand, four hundred twenty-five".