72322581 has 8 divisors (see below), whose sum is σ = 98249760. Its totient is φ = 47305232.

The previous prime is 72322577. The next prime is 72322589. The reversal of 72322581 is 18522327.

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 72322581 - 2² = 72322577 is a prime.

It is a super-2 number, since 2×72322581² = 10461111445003122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72322589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227271 + ... + 227588.

It is an arithmetic number, because the mean of its divisors is an integer number (12281220).

Almost surely, 2^72322581 is an apocalyptic number.

It is an amenable number.

72322581 is a deficient number, since it is larger than the sum of its proper divisors (25927179).

72322581 is a wasteful number, since it uses less digits than its factorization.

72322581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454915.

The product of its digits is 6720, while the sum is 30.

The square root of 72322581 is about 8504.2683988689. The cubic root of 72322581 is about 416.6371312042.

The spelling of 72322581 in words is "seventy-two million, three hundred twenty-two thousand, five hundred eighty-one".