72986908817 has 4 divisors (see below), whose sum is σ = 72987780096. Its totient is φ = 72986037540.

The previous prime is 72986908793. The next prime is 72986908867. The reversal of 72986908817 is 71880968927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72986908817 - 2²⁸ = 72718473361 is a prime.

It is a super-2 number, since 2×72986908817² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72986908867) 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, 294809 + ... + 482582.

It is an arithmetic number, because the mean of its divisors is an integer number (18246945024).

Almost surely, 2^72986908817 is an apocalyptic number.

It is an amenable number.

72986908817 is a deficient number, since it is larger than the sum of its proper divisors (871279).

72986908817 is an equidigital number, since it uses as much as digits as its factorization.

72986908817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871278.

The product of its (nonzero) digits is 24385536, while the sum is 65.

The spelling of 72986908817 in words is "seventy-two billion, nine hundred eighty-six million, nine hundred eight thousand, eight hundred seventeen".