72805881 has 8 divisors (see below), whose sum is σ = 97568064. Its totient is φ = 48290480.

The previous prime is 72805877. The next prime is 72805907. The reversal of 72805881 is 18850827.

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 72805881 - 2² = 72805877 is a prime.

It is a super-2 number, since 2×72805881² = 10601392616372322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72805801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61005 + ... + 62186.

It is an arithmetic number, because the mean of its divisors is an integer number (12196008).

Almost surely, 2^72805881 is an apocalyptic number.

It is an amenable number.

72805881 is a deficient number, since it is larger than the sum of its proper divisors (24762183).

72805881 is a wasteful number, since it uses less digits than its factorization.

72805881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123391.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 72805881 is about 8532.6362280364. The cubic root of 72805881 is about 417.5631391236.

The spelling of 72805881 in words is "seventy-two million, eight hundred five thousand, eight hundred eighty-one".