22428278 has 4 divisors (see below), whose sum is σ = 33642420. Its totient is φ = 11214138.

The previous prime is 22428277. The next prime is 22428349. The reversal of 22428278 is 87282422.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22428277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5607068 + ... + 5607071.

It is an arithmetic number, because the mean of its divisors is an integer number (8410605).

Almost surely, 2^22428278 is an apocalyptic number.

22428278 is a deficient number, since it is larger than the sum of its proper divisors (11214142).

22428278 is a wasteful number, since it uses less digits than its factorization.

22428278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11214141.

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

The square root of 22428278 is about 4735.8502932420. The cubic root of 22428278 is about 282.0105205404.

The spelling of 22428278 in words is "twenty-two million, four hundred twenty-eight thousand, two hundred seventy-eight".