22727791 has 4 divisors (see below), whose sum is σ = 22872712. Its totient is φ = 22582872.

The previous prime is 22727777. The next prime is 22727797. The reversal of 22727791 is 19772722.

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 22727791 - 2⁹ = 22727279 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 22727791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22727797) 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, 72225 + ... + 72538.

It is an arithmetic number, because the mean of its divisors is an integer number (5718178).

Almost surely, 2^22727791 is an apocalyptic number.

22727791 is a deficient number, since it is larger than the sum of its proper divisors (144921).

22727791 is a wasteful number, since it uses less digits than its factorization.

22727791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144920.

The product of its digits is 24696, while the sum is 37.

The square root of 22727791 is about 4767.3673028203. The cubic root of 22727791 is about 283.2603205947.

The spelling of 22727791 in words is "twenty-two million, seven hundred twenty-seven thousand, seven hundred ninety-one".