22718818 has 4 divisors (see below), whose sum is σ = 34078230. Its totient is φ = 11359408.

The previous prime is 22718809. The next prime is 22718819. The reversal of 22718818 is 81881722.

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., 19210689 + 3508129 = 4383^2 + 1873^2 .

It is a super-2 number, since 2×22718818² = 1032289382634248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22718819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5679703 + ... + 5679706.

Almost surely, 2^22718818 is an apocalyptic number.

22718818 is a deficient number, since it is larger than the sum of its proper divisors (11359412).

22718818 is a wasteful number, since it uses less digits than its factorization.

22718818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11359411.

The product of its digits is 14336, while the sum is 37.

The square root of 22718818 is about 4766.4261244668. The cubic root of 22718818 is about 283.2230383468.

The spelling of 22718818 in words is "twenty-two million, seven hundred eighteen thousand, eight hundred eighteen".