73904221 has 8 divisors (see below), whose sum is σ = 77727744. Its totient is φ = 70131600.

The previous prime is 73904213. The next prime is 73904231. The reversal of 73904221 is 12240937.

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

It is not a de Polignac number, because 73904221 - 2³ = 73904213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73904221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73904231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9730 + ... + 15571.

It is an arithmetic number, because the mean of its divisors is an integer number (9715968).

Almost surely, 2^73904221 is an apocalyptic number.

It is an amenable number.

73904221 is a deficient number, since it is larger than the sum of its proper divisors (3823523).

73904221 is a wasteful number, since it uses less digits than its factorization.

73904221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25451.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 73904221 is about 8596.7564232099. The cubic root of 73904221 is about 419.6524354357.

It can be divided in two parts, 7390 and 4221, that added together give a palindrome (11611).

The spelling of 73904221 in words is "seventy-three million, nine hundred four thousand, two hundred twenty-one".