22278624 has 48 divisors (see below), whose sum is σ = 58786560. Its totient is φ = 7387520.

The previous prime is 22278623. The next prime is 22278631. The reversal of 22278624 is 42687222.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22278623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22459 + ... + 23429.

It is an arithmetic number, because the mean of its divisors is an integer number (1224720).

Almost surely, 2^22278624 is an apocalyptic number.

22278624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22278624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29393280).

22278624 is an abundant number, since it is smaller than the sum of its proper divisors (36507936).

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

22278624 is a wasteful number, since it uses less digits than its factorization.

22278624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223 (or 1215 counting only the distinct ones).

The product of its digits is 21504, while the sum is 33.

The square root of 22278624 is about 4720.0237287539. The cubic root of 22278624 is about 281.3818763272.

The spelling of 22278624 in words is "twenty-two million, two hundred seventy-eight thousand, six hundred twenty-four".