72511522 has 8 divisors (see below), whose sum is σ = 109191276. Its totient is φ = 36114432.

The previous prime is 72511507. The next prime is 72511529. The reversal of 72511522 is 22511527.

It can be written as a sum of positive squares in 2 ways, for example, as 69239041 + 3272481 = 8321^2 + 1809^2 .

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

It is not an unprimeable number, because it can be changed into a prime (72511529) 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, 70023 + ... + 71050.

Almost surely, 2^72511522 is an apocalyptic number.

72511522 is a deficient number, since it is larger than the sum of its proper divisors (36679754).

72511522 is a wasteful number, since it uses less digits than its factorization.

72511522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141332.

The product of its digits is 1400, while the sum is 25.

The square root of 72511522 is about 8515.3697512204. The cubic root of 72511522 is about 416.9996338657. Note that the first 3 decimals are identical.

The spelling of 72511522 in words is "seventy-two million, five hundred eleven thousand, five hundred twenty-two".