22278434 has 4 divisors (see below), whose sum is σ = 33417654. Its totient is φ = 11139216.

The previous prime is 22278433. The next prime is 22278437. The reversal of 22278434 is 43487222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43487222 = 2 ⋅21743611.

It can be written as a sum of positive squares in only one way, i.e., 19829209 + 2449225 = 4453^2 + 1565^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22278434.

It is not an unprimeable number, because it can be changed into a prime (22278433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5569607 + ... + 5569610.

Almost surely, 2^22278434 is an apocalyptic number.

22278434 is a deficient number, since it is larger than the sum of its proper divisors (11139220).

22278434 is a wasteful number, since it uses less digits than its factorization.

22278434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11139219.

The product of its digits is 21504, while the sum is 32.

The square root of 22278434 is about 4720.0036016935. The cubic root of 22278434 is about 281.3810764168.

The spelling of 22278434 in words is "twenty-two million, two hundred seventy-eight thousand, four hundred thirty-four".