73644638 has 8 divisors (see below), whose sum is σ = 113036088. Its totient is φ = 35965944.

The previous prime is 73644611. The next prime is 73644661. The reversal of 73644638 is 83644637.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 73644595 and 73644604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428081 + ... + 428252.

It is an arithmetic number, because the mean of its divisors is an integer number (14129511).

Almost surely, 2^73644638 is an apocalyptic number.

73644638 is a deficient number, since it is larger than the sum of its proper divisors (39391450).

73644638 is a wasteful number, since it uses less digits than its factorization.

73644638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856378.

The product of its digits is 290304, while the sum is 41.

The square root of 73644638 is about 8581.6454133226. The cubic root of 73644638 is about 419.1605265492.

Subtracting 73644638 from its reverse (83644637), we obtain a palindrome (9999999).

The spelling of 73644638 in words is "seventy-three million, six hundred forty-four thousand, six hundred thirty-eight".