72881040149 has 4 divisors (see below), whose sum is σ = 73879410636. Its totient is φ = 71882669664.

The previous prime is 72881040137. The next prime is 72881040209. The reversal of 72881040149 is 94104018827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63892672900 + 8988367249 = 252770^2 + 94807^2 .

It is a cyclic number.

It is not a de Polignac number, because 72881040149 - 2²⁰ = 72879991573 is a prime.

It is a super-3 number, since 3×72881040149³ (a number of 34 digits) contains 333 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 (72881040109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499185134 + ... + 499185279.

It is an arithmetic number, because the mean of its divisors is an integer number (18469852659).

Almost surely, 2^72881040149 is an apocalyptic number.

It is an amenable number.

72881040149 is a deficient number, since it is larger than the sum of its proper divisors (998370487).

72881040149 is an equidigital number, since it uses as much as digits as its factorization.

72881040149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998370486.

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 72881040149 in words is "seventy-two billion, eight hundred eighty-one million, forty thousand, one hundred forty-nine".