22428288 has 48 divisors (see below), whose sum is σ = 64543050. Its totient is φ = 7475712.

The previous prime is 22428277. The next prime is 22428349. The reversal of 22428288 is 88282422.

It can be written as a sum of positive squares in only one way, i.e., 20142144 + 2286144 = 4488^2 + 1512^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×22428288² = 1006056205221888, which contains 22 as substring.

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

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8583 + ... + 10886.

Almost surely, 2^22428288 is an apocalyptic number.

It is an amenable number.

22428288 is an abundant number, since it is smaller than the sum of its proper divisors (42114762).

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

22428288 is a wasteful number, since it uses less digits than its factorization.

22428288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19489 (or 19474 counting only the distinct ones).

The product of its digits is 32768, while the sum is 36.

The square root of 22428288 is about 4735.8513490185. The cubic root of 22428288 is about 282.0105624533.

The spelling of 22428288 in words is "twenty-two million, four hundred twenty-eight thousand, two hundred eighty-eight".