72706217 has 8 divisors (see below), whose sum is σ = 76611360. Its totient is φ = 68808960.

The previous prime is 72706211. The next prime is 72706237. The reversal of 72706217 is 71260727.

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 72706217 - 2²² = 68511913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72706211) 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, 33353 + ... + 35465.

It is an arithmetic number, because the mean of its divisors is an integer number (9576420).

Almost surely, 2^72706217 is an apocalyptic number.

It is an amenable number.

72706217 is a deficient number, since it is larger than the sum of its proper divisors (3905143).

72706217 is a wasteful number, since it uses less digits than its factorization.

72706217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3943.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 72706217 is about 8526.7940634215. The cubic root of 72706217 is about 417.3725179999.

The spelling of 72706217 in words is "seventy-two million, seven hundred six thousand, two hundred seventeen".