72216725 has 12 divisors (see below), whose sum is σ = 102341664. Its totient is φ = 49519920.

The previous prime is 72216713. The next prime is 72216733. The reversal of 72216725 is 52761227.

It is not a de Polignac number, because 72216725 - 2⁴ = 72216709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72216691 and 72216700.

It is a congruent number.

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, 206159 + ... + 206508.

It is an arithmetic number, because the mean of its divisors is an integer number (8528472).

Almost surely, 2^72216725 is an apocalyptic number.

It is an amenable number.

72216725 is a deficient number, since it is larger than the sum of its proper divisors (30124939).

72216725 is a wasteful number, since it uses less digits than its factorization.

72216725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412684 (or 412679 counting only the distinct ones).

The product of its digits is 11760, while the sum is 32.

The square root of 72216725 is about 8498.0424216404. The cubic root of 72216725 is about 416.4337596124.

The spelling of 72216725 in words is "seventy-two million, two hundred sixteen thousand, seven hundred twenty-five".