72744376891 has 2 divisors, whose sum is σ = 72744376892. Its totient is φ = 72744376890.

The previous prime is 72744376829. The next prime is 72744376933. The reversal of 72744376891 is 19867344727.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72744376891 is a prime.

It is not a weakly prime, because it can be changed into another prime (72744376091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36372188445 + 36372188446.

It is an arithmetic number, because the mean of its divisors is an integer number (36372188446).

Almost surely, 2^72744376891 is an apocalyptic number.

72744376891 is a deficient number, since it is larger than the sum of its proper divisors (1).

72744376891 is an equidigital number, since it uses as much as digits as its factorization.

72744376891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14224896, while the sum is 58.

The spelling of 72744376891 in words is "seventy-two billion, seven hundred forty-four million, three hundred seventy-six thousand, eight hundred ninety-one".