72786221 has 8 divisors (see below), whose sum is σ = 74459520. Its totient is φ = 71118208.

The previous prime is 72786209. The next prime is 72786223. The reversal of 72786221 is 12268727.

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

It is a cyclic number.

It is not a de Polignac number, because 72786221 - 2⁶ = 72786157 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 (72786223) 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, 42830 + ... + 44496.

It is an arithmetic number, because the mean of its divisors is an integer number (9307440).

Almost surely, 2^72786221 is an apocalyptic number.

It is an amenable number.

72786221 is a deficient number, since it is larger than the sum of its proper divisors (1673299).

72786221 is a wasteful number, since it uses less digits than its factorization.

72786221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643.

The product of its digits is 18816, while the sum is 35.

The square root of 72786221 is about 8531.4841030151. The cubic root of 72786221 is about 417.5255504461.

The spelling of 72786221 in words is "seventy-two million, seven hundred eighty-six thousand, two hundred twenty-one".