72090981313 has 4 divisors (see below), whose sum is σ = 77636441428. Its totient is φ = 66545521200.

The previous prime is 72090981299. The next prime is 72090981329. The reversal of 72090981313 is 31318909027.

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 46101672369 + 25989308944 = 214713^2 + 161212^2 .

It is a cyclic number.

It is not a de Polignac number, because 72090981313 - 2²⁹ = 71554110401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72090981313.

It is not an unprimeable number, because it can be changed into a prime (72090981343) 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, 2772730038 + ... + 2772730063.

It is an arithmetic number, because the mean of its divisors is an integer number (19409110357).

Almost surely, 2^72090981313 is an apocalyptic number.

It is an amenable number.

72090981313 is a deficient number, since it is larger than the sum of its proper divisors (5545460115).

72090981313 is a wasteful number, since it uses less digits than its factorization.

72090981313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5545460114.

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 72090981313 in words is "seventy-two billion, ninety million, nine hundred eighty-one thousand, three hundred thirteen".