22628387 has 4 divisors (see below), whose sum is σ = 22639176. Its totient is φ = 22617600.

The previous prime is 22628383. The next prime is 22628399. The reversal of 22628387 is 78382622.

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 22628387 - 2² = 22628383 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 22628387.

It is not an unprimeable number, because it can be changed into a prime (22628383) 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, 1118 + ... + 6819.

It is an arithmetic number, because the mean of its divisors is an integer number (5659794).

Almost surely, 2^22628387 is an apocalyptic number.

22628387 is a deficient number, since it is larger than the sum of its proper divisors (10789).

22628387 is an equidigital number, since it uses as much as digits as its factorization.

22628387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10788.

The product of its digits is 64512, while the sum is 38.

The square root of 22628387 is about 4756.9304178220. The cubic root of 22628387 is about 282.8467540920.

The spelling of 22628387 in words is "twenty-two million, six hundred twenty-eight thousand, three hundred eighty-seven".