22742647 has 4 divisors (see below), whose sum is σ = 22752376. Its totient is φ = 22732920.

The previous prime is 22742633. The next prime is 22742663. The reversal of 22742647 is 74624722.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22742647 - 2⁷ = 22742519 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 (22742627) 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, 997 + ... + 6817.

It is an arithmetic number, because the mean of its divisors is an integer number (5688094).

Almost surely, 2^22742647 is an apocalyptic number.

22742647 is a deficient number, since it is larger than the sum of its proper divisors (9729).

22742647 is an equidigital number, since it uses as much as digits as its factorization.

22742647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9728.

The product of its digits is 37632, while the sum is 34.

The square root of 22742647 is about 4768.9251409516. The cubic root of 22742647 is about 283.3220247697.

It can be divided in two parts, 227 and 42647, that multiplied together give a palindrome (9680869).

The spelling of 22742647 in words is "twenty-two million, seven hundred forty-two thousand, six hundred forty-seven".