72131217 has 8 divisors (see below), whose sum is σ = 97805280. Its totient is φ = 47272320.

The previous prime is 72131159. The next prime is 72131231. The reversal of 72131217 is 71213127.

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

It is not a de Polignac number, because 72131217 - 2¹⁶ = 72065681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72131117) 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, 203584 + ... + 203937.

It is an arithmetic number, because the mean of its divisors is an integer number (12225660).

Almost surely, 2^72131217 is an apocalyptic number.

It is an amenable number.

72131217 is a deficient number, since it is larger than the sum of its proper divisors (25674063).

72131217 is a wasteful number, since it uses less digits than its factorization.

72131217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407583.

The product of its digits is 588, while the sum is 24.

The square root of 72131217 is about 8493.0098904923. The cubic root of 72131217 is about 416.2693356456.

The spelling of 72131217 in words is "seventy-two million, one hundred thirty-one thousand, two hundred seventeen".