22278256 has 120 divisors (see below), whose sum is σ = 58817664. Its totient is φ = 7937280.

The previous prime is 22278247. The next prime is 22278287. The reversal of 22278256 is 65287222.

22278256 = T₁₈₃ + T₁₈₄ + ... + T₅₁₈.

It is a happy number.

Its product of digits (26880) is a multiple of the sum of its prime divisors (140).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208155 + ... + 208261.

Almost surely, 2^22278256 is an apocalyptic number.

22278256 is a gapful number since it is divisible by the number (26) 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 22278256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29408832).

22278256 is an abundant number, since it is smaller than the sum of its proper divisors (36539408).

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

22278256 is a wasteful number, since it uses less digits than its factorization.

22278256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 140 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 22278256 is about 4719.9847457381. The cubic root of 22278256 is about 281.3803270230.

The spelling of 22278256 in words is "twenty-two million, two hundred seventy-eight thousand, two hundred fifty-six".