72781225 has 12 divisors (see below), whose sum is σ = 98453520. Its totient is φ = 52931600.

The previous prime is 72781207. The next prime is 72781231. The reversal of 72781225 is 52218727.

It is not a de Polignac number, because 72781225 - 2⁵ = 72781193 is a prime.

It is an unprimeable number.

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, 132055 + ... + 132604.

It is an arithmetic number, because the mean of its divisors is an integer number (8204460).

Almost surely, 2^72781225 is an apocalyptic number.

It is an amenable number.

72781225 is a deficient number, since it is larger than the sum of its proper divisors (25672295).

72781225 is a wasteful number, since it uses less digits than its factorization.

72781225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264680 (or 264675 counting only the distinct ones).

The product of its digits is 15680, while the sum is 34.

The square root of 72781225 is about 8531.1913001644. The cubic root of 72781225 is about 417.5159973313.

The spelling of 72781225 in words is "seventy-two million, seven hundred eighty-one thousand, two hundred twenty-five".