22724638 has 4 divisors (see below), whose sum is σ = 34086960. Its totient is φ = 11362318.

The previous prime is 22724609. The next prime is 22724659. The reversal of 22724638 is 83642722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83642722 = 2 ⋅41821361.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5681158 + ... + 5681161.

It is an arithmetic number, because the mean of its divisors is an integer number (8521740).

Almost surely, 2^22724638 is an apocalyptic number.

22724638 is a deficient number, since it is larger than the sum of its proper divisors (11362322).

22724638 is a wasteful number, since it uses less digits than its factorization.

22724638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11362321.

The product of its digits is 32256, while the sum is 34.

The square root of 22724638 is about 4767.0366056912. The cubic root of 22724638 is about 283.2472211974.

The spelling of 22724638 in words is "twenty-two million, seven hundred twenty-four thousand, six hundred thirty-eight".