73243638 has 96 divisors (see below), whose sum is σ = 184504320. Its totient is φ = 20813760.

The previous prime is 73243637. The next prime is 73243649. The reversal of 73243638 is 83634237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73243637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 166623 + ... + 167061.

It is an arithmetic number, because the mean of its divisors is an integer number (1921920).

Almost surely, 2^73243638 is an apocalyptic number.

73243638 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 73243638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92252160).

73243638 is an abundant number, since it is smaller than the sum of its proper divisors (111260682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73243638 is a wasteful number, since it uses less digits than its factorization.

73243638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514 (or 511 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 73243638 is about 8558.2497042328. The cubic root of 73243638 is about 418.3983557742.

The spelling of 73243638 in words is "seventy-three million, two hundred forty-three thousand, six hundred thirty-eight".