72581225 has 6 divisors (see below), whose sum is σ = 90000750. Its totient is φ = 58064960.

The previous prime is 72581209. The next prime is 72581227. The reversal of 72581225 is 52218527.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 891136 + 71690089 = 944^2 + 8467^2 .

It is not a de Polignac number, because 72581225 - 2⁴ = 72581209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72581191 and 72581200.

It is not an unprimeable number, because it can be changed into a prime (72581227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1451600 + ... + 1451649.

It is an arithmetic number, because the mean of its divisors is an integer number (15000125).

Almost surely, 2^72581225 is an apocalyptic number.

It is an amenable number.

72581225 is a deficient number, since it is larger than the sum of its proper divisors (17419525).

72581225 is a wasteful number, since it uses less digits than its factorization.

72581225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903259 (or 2903254 counting only the distinct ones).

The product of its digits is 11200, while the sum is 32.

The square root of 72581225 is about 8519.4615440179. The cubic root of 72581225 is about 417.1332071986.

The spelling of 72581225 in words is "seventy-two million, five hundred eighty-one thousand, two hundred twenty-five".