22698778 has 4 divisors (see below), whose sum is σ = 34048170. Its totient is φ = 11349388.

The previous prime is 22698761. The next prime is 22698779. The reversal of 22698778 is 87789622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87789622 = 2 ⋅43894811.

It can be written as a sum of positive squares in only one way, i.e., 14953689 + 7745089 = 3867^2 + 2783^2 .

It is not an unprimeable number, because it can be changed into a prime (22698779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5674693 + ... + 5674696.

Almost surely, 2^22698778 is an apocalyptic number.

22698778 is a deficient number, since it is larger than the sum of its proper divisors (11349392).

22698778 is a wasteful number, since it uses less digits than its factorization.

22698778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11349391.

The product of its digits is 677376, while the sum is 49.

The square root of 22698778 is about 4764.3234566935. The cubic root of 22698778 is about 283.1397379545.

The spelling of 22698778 in words is "twenty-two million, six hundred ninety-eight thousand, seven hundred seventy-eight".