22642257 has 16 divisors (see below), whose sum is σ = 33066432. Its totient is φ = 13667520.

The previous prime is 22642229. The next prime is 22642259. The reversal of 22642257 is 75224622.

It is not a de Polignac number, because 22642257 - 2⁸ = 22642001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22642259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7903 + ... + 10379.

It is an arithmetic number, because the mean of its divisors is an integer number (2066652).

Almost surely, 2^22642257 is an apocalyptic number.

It is an amenable number.

22642257 is a deficient number, since it is larger than the sum of its proper divisors (10424175).

22642257 is a wasteful number, since it uses less digits than its factorization.

22642257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768.

The product of its digits is 13440, while the sum is 30.

The square root of 22642257 is about 4758.3880674027. The cubic root of 22642257 is about 282.9045323037.

Adding to 22642257 its reverse (75224622), we get a palindrome (97866879).

The spelling of 22642257 in words is "twenty-two million, six hundred forty-two thousand, two hundred fifty-seven".