22222778 has 8 divisors (see below), whose sum is σ = 33364980. Its totient is φ = 11101120.

The previous prime is 22222769. The next prime is 22222789. The reversal of 22222778 is 87722222.

It can be written as a sum of positive squares in 2 ways, for example, as 13300609 + 8922169 = 3647^2 + 2987^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2063 + ... + 6978.

Almost surely, 2^22222778 is an apocalyptic number.

22222778 is a deficient number, since it is larger than the sum of its proper divisors (11142202).

22222778 is a wasteful number, since it uses less digits than its factorization.

22222778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10272.

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

The square root of 22222778 is about 4714.1041566771. The cubic root of 22222778 is about 281.1465655534.

It can be divided in two parts, 2222 and 2778, that multiplied together give a palindrome (6172716).

The spelling of 22222778 in words is "twenty-two million, two hundred twenty-two thousand, seven hundred seventy-eight".