72881069 has 2 divisors, whose sum is σ = 72881070. Its totient is φ = 72881068.

The previous prime is 72881041. The next prime is 72881071. The reversal of 72881069 is 96018827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70778569 + 2102500 = 8413^2 + 1450^2 .

It is an emirp because it is prime and its reverse (96018827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72881069 - 2²⁰ = 71832493 is a prime.

It is a super-2 number, since 2×72881069² = 10623300437165522, which contains 22 as substring.

Together with 72881071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72881099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36440534 + 36440535.

It is an arithmetic number, because the mean of its divisors is an integer number (36440535).

Almost surely, 2^72881069 is an apocalyptic number.

It is an amenable number.

72881069 is a deficient number, since it is larger than the sum of its proper divisors (1).

72881069 is an equidigital number, since it uses as much as digits as its factorization.

72881069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 72881069 is about 8537.0409979102. The cubic root of 72881069 is about 417.7068314344.

The spelling of 72881069 in words is "seventy-two million, eight hundred eighty-one thousand, sixty-nine".