72305670091 has 4 divisors (see below), whose sum is σ = 73007666992. Its totient is φ = 71603673192.

The previous prime is 72305670013. The next prime is 72305670097. The reversal of 72305670091 is 19007650327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19007650327 = 149 ⋅127568123.

It is a cyclic number.

It is not a de Polignac number, because 72305670091 - 2²⁷ = 72171452363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72305670097) 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, 350998296 + ... + 350998501.

It is an arithmetic number, because the mean of its divisors is an integer number (18251916748).

Almost surely, 2^72305670091 is an apocalyptic number.

72305670091 is a deficient number, since it is larger than the sum of its proper divisors (701996901).

72305670091 is a wasteful number, since it uses less digits than its factorization.

72305670091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701996900.

The product of its (nonzero) digits is 79380, while the sum is 40.

The spelling of 72305670091 in words is "seventy-two billion, three hundred five million, six hundred seventy thousand, ninety-one".