72532217 has 4 divisors (see below), whose sum is σ = 76798836. Its totient is φ = 68265600.

The previous prime is 72532199. The next prime is 72532231. The reversal of 72532217 is 71223527.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19882681 + 52649536 = 4459^2 + 7256^2 .

It is a cyclic number.

It is not a de Polignac number, because 72532217 - 2¹² = 72528121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72532217.

It is not an unprimeable number, because it can be changed into a prime (72532237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2133284 + ... + 2133317.

It is an arithmetic number, because the mean of its divisors is an integer number (19199709).

Almost surely, 2^72532217 is an apocalyptic number.

It is an amenable number.

72532217 is a deficient number, since it is larger than the sum of its proper divisors (4266619).

72532217 is a wasteful number, since it uses less digits than its factorization.

72532217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4266618.

The product of its digits is 5880, while the sum is 29.

The square root of 72532217 is about 8516.5848202199. The cubic root of 72532217 is about 417.0393010631.

The spelling of 72532217 in words is "seventy-two million, five hundred thirty-two thousand, two hundred seventeen".