73312609 has 4 divisors (see below), whose sum is σ = 75840660. Its totient is φ = 70784560.

The previous prime is 73312607. The next prime is 73312627. The reversal of 73312609 is 90621337.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20793600 + 52519009 = 4560^2 + 7247^2 .

It is a cyclic number.

It is not a de Polignac number, because 73312609 - 2¹ = 73312607 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73312607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1263982 + ... + 1264039.

It is an arithmetic number, because the mean of its divisors is an integer number (18960165).

Almost surely, 2^73312609 is an apocalyptic number.

It is an amenable number.

73312609 is a deficient number, since it is larger than the sum of its proper divisors (2528051).

73312609 is a wasteful number, since it uses less digits than its factorization.

73312609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528050.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 73312609 is about 8562.2782599026. The cubic root of 73312609 is about 418.5296449916.

The spelling of 73312609 in words is "seventy-three million, three hundred twelve thousand, six hundred nine".