72225616 has 20 divisors (see below), whose sum is σ = 141856372. Its totient is φ = 35617536.

The previous prime is 72225607. The next prime is 72225649. The reversal of 72225616 is 61652227.

It can be written as a sum of positive squares in 2 ways, for example, as 32535616 + 39690000 = 5704^2 + 6300^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29751 + ... + 32086.

Almost surely, 2^72225616 is an apocalyptic number.

It is an amenable number.

72225616 is a deficient number, since it is larger than the sum of its proper divisors (69630756).

72225616 is a wasteful number, since it uses less digits than its factorization.

72225616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61918 (or 61912 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 72225616 is about 8498.5655260167. The cubic root of 72225616 is about 416.4508487314.

The spelling of 72225616 in words is "seventy-two million, two hundred twenty-five thousand, six hundred sixteen".