72780793 has 2 divisors, whose sum is σ = 72780794. Its totient is φ = 72780792.

The previous prime is 72780787. The next prime is 72780803. The reversal of 72780793 is 39708727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71774784 + 1006009 = 8472^2 + 1003^2 .

It is a cyclic number.

It is not a de Polignac number, because 72780793 - 2⁵ = 72780761 is a prime.

It is not a weakly prime, because it can be changed into another prime (72780193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36390396 + 36390397.

It is an arithmetic number, because the mean of its divisors is an integer number (36390397).

Almost surely, 2^72780793 is an apocalyptic number.

It is an amenable number.

72780793 is a deficient number, since it is larger than the sum of its proper divisors (1).

72780793 is an equidigital number, since it uses as much as digits as its factorization.

72780793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 72780793 is about 8531.1659812713. The cubic root of 72780793 is about 417.5151712608.

The spelling of 72780793 in words is "seventy-two million, seven hundred eighty thousand, seven hundred ninety-three".