22778444 has 12 divisors (see below), whose sum is σ = 42928704. Its totient is φ = 10513104.

The previous prime is 22778443. The next prime is 22778449. The reversal of 22778444 is 44487722.

It is a super-2 number, since 2×22778444² = 1037715022122272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22778398 and 22778407.

It is not an unprimeable number, because it can be changed into a prime (22778443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218972 + ... + 219075.

It is an arithmetic number, because the mean of its divisors is an integer number (3577392).

Almost surely, 2^22778444 is an apocalyptic number.

It is an amenable number.

22778444 is a deficient number, since it is larger than the sum of its proper divisors (20150260).

22778444 is a wasteful number, since it uses less digits than its factorization.

22778444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438064 (or 438062 counting only the distinct ones).

The product of its digits is 100352, while the sum is 38.

The square root of 22778444 is about 4772.6768170493. The cubic root of 22778444 is about 283.4705967741.

The spelling of 22778444 in words is "twenty-two million, seven hundred seventy-eight thousand, four hundred forty-four".