72724217 has 8 divisors (see below), whose sum is σ = 73416000. Its totient is φ = 72036144.

The previous prime is 72724213. The next prime is 72724231. The reversal of 72724217 is 71242727.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72724217 - 2² = 72724213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72724213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51284 + ... + 52682.

It is an arithmetic number, because the mean of its divisors is an integer number (9177000).

Almost surely, 2^72724217 is an apocalyptic number.

It is an amenable number.

72724217 is a deficient number, since it is larger than the sum of its proper divisors (691783).

72724217 is a wasteful number, since it uses less digits than its factorization.

72724217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855.

The product of its digits is 10976, while the sum is 32.

The square root of 72724217 is about 8527.8494944505. The cubic root of 72724217 is about 417.4069583625.

The spelling of 72724217 in words is "seventy-two million, seven hundred twenty-four thousand, two hundred seventeen".