72222791 has 4 divisors (see below), whose sum is σ = 72267000. Its totient is φ = 72178584.

The previous prime is 72222763. The next prime is 72222793. The reversal of 72222791 is 19722227.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72222791 - 2²² = 68028487 is a prime.

It is a super-2 number, since 2×72222791² = 10432263079659362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72222793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19556 + ... + 22953.

It is an arithmetic number, because the mean of its divisors is an integer number (18066750).

Almost surely, 2^72222791 is an apocalyptic number.

72222791 is a deficient number, since it is larger than the sum of its proper divisors (44209).

72222791 is a wasteful number, since it uses less digits than its factorization.

72222791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44208.

The product of its digits is 7056, while the sum is 32.

The square root of 72222791 is about 8498.3993198719. The cubic root of 72222791 is about 416.4454190373.

The spelling of 72222791 in words is "seventy-two million, two hundred twenty-two thousand, seven hundred ninety-one".