73644809 has 16 divisors (see below), whose sum is σ = 88089600. Its totient is φ = 60238080.

The previous prime is 73644793. The next prime is 73644811. The reversal of 73644809 is 90844637.

It is not a de Polignac number, because 73644809 - 2⁴ = 73644793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73644839) 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 15 ways as a sum of consecutive naturals, for example, 13517 + ... + 18165.

It is an arithmetic number, because the mean of its divisors is an integer number (5505600).

Almost surely, 2^73644809 is an apocalyptic number.

It is an amenable number.

73644809 is a deficient number, since it is larger than the sum of its proper divisors (14444791).

73644809 is a wasteful number, since it uses less digits than its factorization.

73644809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4760.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 73644809 is about 8581.6553764411. The cubic root of 73644809 is about 419.1608509738.

The spelling of 73644809 in words is "seventy-three million, six hundred forty-four thousand, eight hundred nine".