22278428 has 12 divisors (see below), whose sum is σ = 39028920. Its totient is φ = 11127312.

The previous prime is 22278427. The next prime is 22278433. The reversal of 22278428 is 82487222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22278427) 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 3 ways as a sum of consecutive naturals, for example, 2258 + ... + 7046.

It is an arithmetic number, because the mean of its divisors is an integer number (3252410).

Almost surely, 2^22278428 is an apocalyptic number.

It is an amenable number.

22278428 is a deficient number, since it is larger than the sum of its proper divisors (16750492).

22278428 is a wasteful number, since it uses less digits than its factorization.

22278428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5956 (or 5954 counting only the distinct ones).

The product of its digits is 28672, while the sum is 35.

The square root of 22278428 is about 4720.0029661008. The cubic root of 22278428 is about 281.3810511564.

The spelling of 22278428 in words is "twenty-two million, two hundred seventy-eight thousand, four hundred twenty-eight".