73718509 has 2 divisors, whose sum is σ = 73718510. Its totient is φ = 73718508.

The previous prime is 73718503. The next prime is 73718573. The reversal of 73718509 is 90581737.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69806025 + 3912484 = 8355^2 + 1978^2 .

It is a cyclic number.

It is not a de Polignac number, because 73718509 - 2³ = 73718501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73718501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36859254 + 36859255.

It is an arithmetic number, because the mean of its divisors is an integer number (36859255).

Almost surely, 2^73718509 is an apocalyptic number.

It is an amenable number.

73718509 is a deficient number, since it is larger than the sum of its proper divisors (1).

73718509 is an equidigital number, since it uses as much as digits as its factorization.

73718509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 73718509 is about 8585.9483459895. The cubic root of 73718509 is about 419.3006293495.

The spelling of 73718509 in words is "seventy-three million, seven hundred eighteen thousand, five hundred nine".