22299778 has 4 divisors (see below), whose sum is σ = 33449670. Its totient is φ = 11149888.

The previous prime is 22299773. The next prime is 22299779. The reversal of 22299778 is 87799222.

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., 14160169 + 8139609 = 3763^2 + 2853^2 .

It is not an unprimeable number, because it can be changed into a prime (22299773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5574943 + ... + 5574946.

Almost surely, 2^22299778 is an apocalyptic number.

22299778 is a deficient number, since it is larger than the sum of its proper divisors (11149892).

22299778 is a wasteful number, since it uses less digits than its factorization.

22299778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11149891.

The product of its digits is 254016, while the sum is 46.

The square root of 22299778 is about 4722.2640756315. The cubic root of 22299778 is about 281.4709073979.

It can be divided in two parts, 222 and 99778, that added together give a 5-th power (100000 = 10⁵).

The spelling of 22299778 in words is "twenty-two million, two hundred ninety-nine thousand, seven hundred seventy-eight".