22747428 has 144 divisors (see below), whose sum is σ = 69189120. Its totient is φ = 6220800.

The previous prime is 22747423. The next prime is 22747429. The reversal of 22747428 is 82474722.

22747428 is a `hidden beast` number, since 227 + 4 + 7 + 428 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22747392 and 22747401.

It is not an unprimeable number, because it can be changed into a prime (22747423) by changing a digit.

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 in 47 ways as a sum of consecutive naturals, for example, 208638 + ... + 208746.

It is an arithmetic number, because the mean of its divisors is an integer number (480480).

Almost surely, 2^22747428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22747428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34594560).

22747428 is an abundant number, since it is smaller than the sum of its proper divisors (46441692).

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

22747428 is a wasteful number, since it uses less digits than its factorization.

22747428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 173 counting only the distinct ones).

The product of its digits is 50176, while the sum is 36.

The square root of 22747428 is about 4769.4263806039. The cubic root of 22747428 is about 283.3418768666.

The spelling of 22747428 in words is "twenty-two million, seven hundred forty-seven thousand, four hundred twenty-eight".