72294221 has 12 divisors (see below), whose sum is σ = 79625952. Its totient is φ = 65503944.

The previous prime is 72294203. The next prime is 72294247. The reversal of 72294221 is 12249227.

It is not a de Polignac number, because 72294221 - 2¹⁴ = 72277837 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 (72294121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3950 + ... + 12656.

It is an arithmetic number, because the mean of its divisors is an integer number (6635496).

Almost surely, 2^72294221 is an apocalyptic number.

It is an amenable number.

72294221 is a deficient number, since it is larger than the sum of its proper divisors (7331731).

72294221 is a wasteful number, since it uses less digits than its factorization.

72294221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8768 (or 8749 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 72294221 is about 8502.6008373909. The cubic root of 72294221 is about 416.5826651639.

The spelling of 72294221 in words is "seventy-two million, two hundred ninety-four thousand, two hundred twenty-one".