72578225 has 12 divisors (see below), whose sum is σ = 93910656. Its totient is φ = 55537680.

The previous prime is 72578221. The next prime is 72578237. The reversal of 72578225 is 52287527.

It is not a de Polignac number, because 72578225 - 2² = 72578221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72578221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62537 + ... + 63686.

It is an arithmetic number, because the mean of its divisors is an integer number (7825888).

Almost surely, 2^72578225 is an apocalyptic number.

It is an amenable number.

72578225 is a deficient number, since it is larger than the sum of its proper divisors (21332431).

72578225 is a wasteful number, since it uses less digits than its factorization.

72578225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126256 (or 126251 counting only the distinct ones).

The product of its digits is 78400, while the sum is 38.

The square root of 72578225 is about 8519.2854747332. The cubic root of 72578225 is about 417.1274599967.

The spelling of 72578225 in words is "seventy-two million, five hundred seventy-eight thousand, two hundred twenty-five".