73438821 has 12 divisors (see below), whose sum is σ = 108945772. Its totient is φ = 47635776.

The previous prime is 73438811. The next prime is 73438823. The reversal of 73438821 is 12883437.

It can be written as a sum of positive squares in 2 ways, for example, as 70056900 + 3381921 = 8370^2 + 1839^2 .

It is not a de Polignac number, because 73438821 - 2¹⁰ = 73437797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73438823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109936 + ... + 110601.

Almost surely, 2^73438821 is an apocalyptic number.

It is an amenable number.

73438821 is a deficient number, since it is larger than the sum of its proper divisors (35506951).

73438821 is a wasteful number, since it uses less digits than its factorization.

73438821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220580 (or 220577 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 73438821 is about 8569.6453252162. The cubic root of 73438821 is about 418.7696818253.

The spelling of 73438821 in words is "seventy-three million, four hundred thirty-eight thousand, eight hundred twenty-one".