72881269 has 4 divisors (see below), whose sum is σ = 72956844. Its totient is φ = 72805696.

The previous prime is 72881233. The next prime is 72881309. The reversal of 72881269 is 96218827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96218827 = 17 ⋅5659931.

It can be written as a sum of positive squares in 2 ways, for example, as 68310225 + 4571044 = 8265^2 + 2138^2 .

It is a cyclic number.

It is not a de Polignac number, because 72881269 - 2⁷ = 72881141 is a prime.

It is a super-2 number, since 2×72881269² = 10623358742100722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72881209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36322 + ... + 38275.

It is an arithmetic number, because the mean of its divisors is an integer number (18239211).

Almost surely, 2^72881269 is an apocalyptic number.

It is an amenable number.

72881269 is a deficient number, since it is larger than the sum of its proper divisors (75575).

72881269 is an equidigital number, since it uses as much as digits as its factorization.

72881269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75574.

The product of its digits is 96768, while the sum is 43.

The square root of 72881269 is about 8537.0527115627. The cubic root of 72881269 is about 417.7072135240.

The spelling of 72881269 in words is "seventy-two million, eight hundred eighty-one thousand, two hundred sixty-nine".