22402778 has 4 divisors (see below), whose sum is σ = 33604170. Its totient is φ = 11201388.

The previous prime is 22402777. The next prime is 22402789. The reversal of 22402778 is 87720422.

It is a happy number.

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., 16752649 + 5650129 = 4093^2 + 2377^2 .

It is not an unprimeable number, because it can be changed into a prime (22402771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5600693 + ... + 5600696.

Almost surely, 2^22402778 is an apocalyptic number.

22402778 is a deficient number, since it is larger than the sum of its proper divisors (11201392).

22402778 is a wasteful number, since it uses less digits than its factorization.

22402778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11201391.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 22402778 is about 4733.1572971960. The cubic root of 22402778 is about 281.9036020127.

The spelling of 22402778 in words is "twenty-two million, four hundred two thousand, seven hundred seventy-eight".