72788789 has 2 divisors, whose sum is σ = 72788790. Its totient is φ = 72788788.

The previous prime is 72788773. The next prime is 72788803. The reversal of 72788789 is 98788727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72760900 + 27889 = 8530^2 + 167^2 .

It is a cyclic number.

It is not a de Polignac number, because 72788789 - 2⁴ = 72788773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72788719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36394394 + 36394395.

It is an arithmetic number, because the mean of its divisors is an integer number (36394395).

Almost surely, 2^72788789 is an apocalyptic number.

It is an amenable number.

72788789 is a deficient number, since it is larger than the sum of its proper divisors (1).

72788789 is an equidigital number, since it uses as much as digits as its factorization.

72788789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3161088, while the sum is 56.

The square root of 72788789 is about 8531.6346030523. The cubic root of 72788789 is about 417.5304606841.

The spelling of 72788789 in words is "seventy-two million, seven hundred eighty-eight thousand, seven hundred eighty-nine".