72216565 has 16 divisors (see below), whose sum is σ = 89008128. Its totient is φ = 56218176.

The previous prime is 72216541. The next prime is 72216631. The reversal of 72216565 is 56561227.

It is a cyclic number.

It is not a de Polignac number, because 72216565 - 2⁷ = 72216437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72216565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81907 + ... + 82783.

It is an arithmetic number, because the mean of its divisors is an integer number (5563008).

Almost surely, 2^72216565 is an apocalyptic number.

It is an amenable number.

72216565 is a deficient number, since it is larger than the sum of its proper divisors (16791563).

72216565 is a wasteful number, since it uses less digits than its factorization.

72216565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308.

The product of its digits is 25200, while the sum is 34.

The square root of 72216565 is about 8498.0330077024. The cubic root of 72216565 is about 416.4334520684.

The spelling of 72216565 in words is "seventy-two million, two hundred sixteen thousand, five hundred sixty-five".