22142778 has 16 divisors (see below), whose sum is σ = 50612160. Its totient is φ = 6326496.

The previous prime is 22142749. The next prime is 22142797. The reversal of 22142778 is 87724122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263563 + ... + 263646.

It is an arithmetic number, because the mean of its divisors is an integer number (3163260).

Almost surely, 2^22142778 is an apocalyptic number.

22142778 is an abundant number, since it is smaller than the sum of its proper divisors (28469382).

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

22142778 is a wasteful number, since it uses less digits than its factorization.

22142778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527221.

The product of its digits is 12544, while the sum is 33.

The square root of 22142778 is about 4705.6113311662. The cubic root of 22142778 is about 280.8087924699.

The spelling of 22142778 in words is "twenty-two million, one hundred forty-two thousand, seven hundred seventy-eight".