22288440 has 32 divisors (see below), whose sum is σ = 66865680. Its totient is φ = 5943552.

The previous prime is 22288439. The next prime is 22288447. The reversal of 22288440 is 4488222.

It is a super-4 number, since 4×22288440⁴ (a number of 30 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 22288398 and 22288407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22288447) 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, 92749 + ... + 92988.

Almost surely, 2^22288440 is an apocalyptic number.

22288440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22288440 is an abundant number, since it is smaller than the sum of its proper divisors (44577240).

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

22288440 is a wasteful number, since it uses less digits than its factorization.

22288440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185751 (or 185747 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 22288440 is about 4721.0634395229. The cubic root of 22288440 is about 281.4231960386.

The spelling of 22288440 in words is "twenty-two million, two hundred eighty-eight thousand, four hundred forty".