72216547 has 16 divisors (see below), whose sum is σ = 79198560. Its totient is φ = 65452032.

The previous prime is 72216541. The next prime is 72216631. The reversal of 72216547 is 74561227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72216547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72216541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268329 + ... + 268597.

It is an arithmetic number, because the mean of its divisors is an integer number (4949910).

Almost surely, 2^72216547 is an apocalyptic number.

72216547 is a deficient number, since it is larger than the sum of its proper divisors (6982013).

72216547 is a wasteful number, since it uses less digits than its factorization.

72216547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582.

The product of its digits is 23520, while the sum is 34.

The square root of 72216547 is about 8498.0319486338. The cubic root of 72216547 is about 416.4334174697.

The spelling of 72216547 in words is "seventy-two million, two hundred sixteen thousand, five hundred forty-seven".