73780709 has 2 divisors, whose sum is σ = 73780710. Its totient is φ = 73780708.

The previous prime is 73780703. The next prime is 73780723. The reversal of 73780709 is 90708737.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56325025 + 17455684 = 7505^2 + 4178^2 .

It is a cyclic number.

It is not a de Polignac number, because 73780709 - 2²⁴ = 57003493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73780703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36890354 + 36890355.

It is an arithmetic number, because the mean of its divisors is an integer number (36890355).

Almost surely, 2^73780709 is an apocalyptic number.

It is an amenable number.

73780709 is a deficient number, since it is larger than the sum of its proper divisors (1).

73780709 is an equidigital number, since it uses as much as digits as its factorization.

73780709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74088, while the sum is 41.

The square root of 73780709 is about 8589.5697796805. The cubic root of 73780709 is about 419.4185245149.

The spelling of 73780709 in words is "seventy-three million, seven hundred eighty thousand, seven hundred nine".