22278000 has 160 divisors (see below), whose sum is σ = 74280960. Its totient is φ = 5740800.

The previous prime is 22277989. The next prime is 22278017. The reversal of 22278000 is 87222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 281961 + ... + 282039.

It is an arithmetic number, because the mean of its divisors is an integer number (464256).

Almost surely, 2^22278000 is an apocalyptic number.

22278000 is a gapful number since it is divisible by the number (20) 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 22278000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37140480).

22278000 is an abundant number, since it is smaller than the sum of its proper divisors (52002960).

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

22278000 is a wasteful number, since it uses less digits than its factorization.

22278000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 22278000 is about 4719.9576269284. The cubic root of 22278000 is about 281.3792492360.

The spelling of 22278000 in words is "twenty-two million, two hundred seventy-eight thousand".