73005409 has 4 divisors (see below), whose sum is σ = 73096240. Its totient is φ = 72914580.

The previous prime is 73005323. The next prime is 73005419. The reversal of 73005409 is 90450037.

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: 90450037 = 8779 ⋅10303.

It is a cyclic number.

It is not a de Polignac number, because 73005409 - 2⁷ = 73005281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73005419) 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, 44199 + ... + 45820.

It is an arithmetic number, because the mean of its divisors is an integer number (18274060).

Almost surely, 2^73005409 is an apocalyptic number.

It is an amenable number.

73005409 is a deficient number, since it is larger than the sum of its proper divisors (90831).

73005409 is an equidigital number, since it uses as much as digits as its factorization.

73005409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90830.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 73005409 is about 8544.3202772368. The cubic root of 73005409 is about 417.9442417785.

The spelling of 73005409 in words is "seventy-three million, five thousand, four hundred nine".