72455581 has 8 divisors (see below), whose sum is σ = 83692224. Its totient is φ = 61993920.

The previous prime is 72455549. The next prime is 72455671. The reversal of 72455581 is 18555427.

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 72455581 - 2⁵ = 72455549 is a prime.

It is a super-2 number, since 2×72455581² = 10499622436095122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72455581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72455521) 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, 193545 + ... + 193918.

It is an arithmetic number, because the mean of its divisors is an integer number (10461528).

Almost surely, 2^72455581 is an apocalyptic number.

It is an amenable number.

72455581 is a deficient number, since it is larger than the sum of its proper divisors (11236643).

72455581 is a wasteful number, since it uses less digits than its factorization.

72455581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387491.

The product of its digits is 56000, while the sum is 37.

The square root of 72455581 is about 8512.0844098258. The cubic root of 72455581 is about 416.8923710138.

The spelling of 72455581 in words is "seventy-two million, four hundred fifty-five thousand, five hundred eighty-one".