30222778 has 4 divisors (see below), whose sum is σ = 45334170. Its totient is φ = 15111388.

The previous prime is 30222763. The next prime is 30222779. The reversal of 30222778 is 87722203.

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., 30173049 + 49729 = 5493^2 + 223^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (30222779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7555693 + ... + 7555696.

Almost surely, 2^30222778 is an apocalyptic number.

30222778 is a deficient number, since it is larger than the sum of its proper divisors (15111392).

30222778 is a wasteful number, since it uses less digits than its factorization.

30222778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15111391.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 30222778 is about 5497.5247157243. The cubic root of 30222778 is about 311.4904912731.

The spelling of 30222778 in words is "thirty million, two hundred twenty-two thousand, seven hundred seventy-eight".