73540209 has 4 divisors (see below), whose sum is σ = 98053616. Its totient is φ = 49026804.

The previous prime is 73540193. The next prime is 73540217. The reversal of 73540209 is 90204537.

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.

It is not a de Polignac number, because 73540209 - 2⁴ = 73540193 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (73540219) 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, 12256699 + ... + 12256704.

It is an arithmetic number, because the mean of its divisors is an integer number (24513404).

Almost surely, 2^73540209 is an apocalyptic number.

It is an amenable number.

73540209 is a deficient number, since it is larger than the sum of its proper divisors (24513407).

73540209 is a wasteful number, since it uses less digits than its factorization.

73540209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24513406.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 73540209 is about 8575.5588156108. The cubic root of 73540209 is about 418.9623079048.

The spelling of 73540209 in words is "seventy-three million, five hundred forty thousand, two hundred nine".