22687728 has 40 divisors (see below), whose sum is σ = 66983808. Its totient is φ = 6482112.

The previous prime is 22687727. The next prime is 22687747. The reversal of 22687728 is 82778622.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 22687728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22687727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33426 + ... + 34097.

Almost surely, 2^22687728 is an apocalyptic number.

22687728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

22687728 is an abundant number, since it is smaller than the sum of its proper divisors (44296080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22687728 is a wasteful number, since it uses less digits than its factorization.

22687728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67541 (or 67535 counting only the distinct ones).

The product of its digits is 150528, while the sum is 42.

The square root of 22687728 is about 4763.1636545473. The cubic root of 22687728 is about 283.0937853789.

The spelling of 22687728 in words is "twenty-two million, six hundred eighty-seven thousand, seven hundred twenty-eight".