73320409 has 4 divisors (see below), whose sum is σ = 73445904. Its totient is φ = 73194916.

The previous prime is 73320293. The next prime is 73320419. The reversal of 73320409 is 90402337.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90402337 = 59 ⋅1532243.

It is a cyclic number.

It is not a de Polignac number, because 73320409 - 2⁷ = 73320281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73320419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61867 + ... + 63040.

It is an arithmetic number, because the mean of its divisors is an integer number (18361476).

Almost surely, 2^73320409 is an apocalyptic number.

It is an amenable number.

73320409 is a deficient number, since it is larger than the sum of its proper divisors (125495).

73320409 is a wasteful number, since it uses less digits than its factorization.

73320409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125494.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 73320409 is about 8562.7337340361. The cubic root of 73320409 is about 418.5444874383.

The spelling of 73320409 in words is "seventy-three million, three hundred twenty thousand, four hundred nine".