72889221 has 4 divisors (see below), whose sum is σ = 97185632. Its totient is φ = 48592812.

The previous prime is 72889211. The next prime is 72889247. The reversal of 72889221 is 12298827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 72889221 - 2⁹ = 72888709 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 72889221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72889211) 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 3 ways as a sum of consecutive naturals, for example, 12148201 + ... + 12148206.

It is an arithmetic number, because the mean of its divisors is an integer number (24296408).

Almost surely, 2^72889221 is an apocalyptic number.

It is an amenable number.

72889221 is a deficient number, since it is larger than the sum of its proper divisors (24296411).

72889221 is a wasteful number, since it uses less digits than its factorization.

72889221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24296410.

The product of its digits is 32256, while the sum is 39.

The square root of 72889221 is about 8537.5184333622. The cubic root of 72889221 is about 417.7224048391.

The spelling of 72889221 in words is "seventy-two million, eight hundred eighty-nine thousand, two hundred twenty-one".