22242778 has 4 divisors (see below), whose sum is σ = 33364170. Its totient is φ = 11121388.

The previous prime is 22242761. The next prime is 22242793. The reversal of 22242778 is 87724222.

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

It can be written as a sum of positive squares in only one way, i.e., 21874329 + 368449 = 4677^2 + 607^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560693 + ... + 5560696.

Almost surely, 2^22242778 is an apocalyptic number.

22242778 is a deficient number, since it is larger than the sum of its proper divisors (11121392).

22242778 is a wasteful number, since it uses less digits than its factorization.

22242778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11121391.

The product of its digits is 25088, while the sum is 34.

The square root of 22242778 is about 4716.2249734295. The cubic root of 22242778 is about 281.2308821244.

The spelling of 22242778 in words is "twenty-two million, two hundred forty-two thousand, seven hundred seventy-eight".