73866809 has 2 divisors, whose sum is σ = 73866810. Its totient is φ = 73866808.

The previous prime is 73866803. The next prime is 73866827. The reversal of 73866809 is 90866837.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46199209 + 27667600 = 6797^2 + 5260^2 .

It is a cyclic number.

It is not a de Polignac number, because 73866809 - 2¹² = 73862713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (73866803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36933404 + 36933405.

It is an arithmetic number, because the mean of its divisors is an integer number (36933405).

Almost surely, 2^73866809 is an apocalyptic number.

It is an amenable number.

73866809 is a deficient number, since it is larger than the sum of its proper divisors (1).

73866809 is an equidigital number, since it uses as much as digits as its factorization.

73866809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 73866809 is about 8594.5802108073. The cubic root of 73866809 is about 419.5816109429.

The spelling of 73866809 in words is "seventy-three million, eight hundred sixty-six thousand, eight hundred nine".