73638644 has 24 divisors (see below), whose sum is σ = 131217408. Its totient is φ = 36152480.

The previous prime is 73638641. The next prime is 73638647. The reversal of 73638644 is 44683637.

It is an interprime number because it is at equal distance from previous prime (73638641) and next prime (73638647).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73638641) 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 7 ways as a sum of consecutive naturals, for example, 108434 + ... + 109110.

It is an arithmetic number, because the mean of its divisors is an integer number (5467392).

Almost surely, 2^73638644 is an apocalyptic number.

It is an amenable number.

73638644 is a deficient number, since it is larger than the sum of its proper divisors (57578764).

73638644 is a wasteful number, since it uses less digits than its factorization.

73638644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135 (or 1133 counting only the distinct ones).

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

The square root of 73638644 is about 8581.2961724905. The cubic root of 73638644 is about 419.1491542962.

The spelling of 73638644 in words is "seventy-three million, six hundred thirty-eight thousand, six hundred forty-four".