73643409 has 24 divisors (see below), whose sum is σ = 123569472. Its totient is φ = 41389920.

The previous prime is 73643389. The next prime is 73643417. The reversal of 73643409 is 90434637.

73643409 is a `hidden beast` number, since 7 + 3 + 643 + 4 + 0 + 9 = 666.

It is not a de Polignac number, because 73643409 - 2⁵ = 73643377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73643459) 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 23 ways as a sum of consecutive naturals, for example, 5739 + ... + 13424.

It is an arithmetic number, because the mean of its divisors is an integer number (5148728).

Almost surely, 2^73643409 is an apocalyptic number.

It is an amenable number.

73643409 is a deficient number, since it is larger than the sum of its proper divisors (49926063).

73643409 is a wasteful number, since it uses less digits than its factorization.

73643409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19237 (or 19234 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 73643409 is about 8581.5738067093. The cubic root of 73643409 is about 419.1581948513.

The spelling of 73643409 in words is "seventy-three million, six hundred forty-three thousand, four hundred nine".