72216247 has 4 divisors (see below), whose sum is σ = 72296776. Its totient is φ = 72135720.

The previous prime is 72216241. The next prime is 72216257. The reversal of 72216247 is 74261227.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72216247 - 2¹¹ = 72214199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72216241) 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 3 ways as a sum of consecutive naturals, for example, 38904 + ... + 40717.

It is an arithmetic number, because the mean of its divisors is an integer number (18074194).

Almost surely, 2^72216247 is an apocalyptic number.

72216247 is a deficient number, since it is larger than the sum of its proper divisors (80529).

72216247 is an equidigital number, since it uses as much as digits as its factorization.

72216247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80528.

The product of its digits is 9408, while the sum is 31.

The square root of 72216247 is about 8498.0142974697. The cubic root of 72216247 is about 416.4328408235.

The spelling of 72216247 in words is "seventy-two million, two hundred sixteen thousand, two hundred forty-seven".