72748782989 has 2 divisors, whose sum is σ = 72748782990. Its totient is φ = 72748782988.

The previous prime is 72748782979. The next prime is 72748783007. The reversal of 72748782989 is 98928784727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38868122500 + 33880660489 = 197150^2 + 184067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72748782989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72748782929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36374391494 + 36374391495.

It is an arithmetic number, because the mean of its divisors is an integer number (36374391495).

Almost surely, 2^72748782989 is an apocalyptic number.

It is an amenable number.

72748782989 is a deficient number, since it is larger than the sum of its proper divisors (1).

72748782989 is an equidigital number, since it uses as much as digits as its factorization.

72748782989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 227598336, while the sum is 71.

The spelling of 72748782989 in words is "seventy-two billion, seven hundred forty-eight million, seven hundred eighty-two thousand, nine hundred eighty-nine".