73708309 has 2 divisors, whose sum is σ = 73708310. Its totient is φ = 73708308.

The previous prime is 73708301. The next prime is 73708337. The reversal of 73708309 is 90380737.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73702225 + 6084 = 8585^2 + 78^2 .

It is an emirp because it is prime and its reverse (90380737) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73708309 - 2³ = 73708301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73708301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36854154 + 36854155.

It is an arithmetic number, because the mean of its divisors is an integer number (36854155).

Almost surely, 2^73708309 is an apocalyptic number.

It is an amenable number.

73708309 is a deficient number, since it is larger than the sum of its proper divisors (1).

73708309 is an equidigital number, since it uses as much as digits as its factorization.

73708309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 73708309 is about 8585.3543316511. The cubic root of 73708309 is about 419.2812897302.

The spelling of 73708309 in words is "seventy-three million, seven hundred eight thousand, three hundred nine".