28181122 has 4 divisors (see below), whose sum is σ = 42271686. Its totient is φ = 14090560.

The previous prime is 28181099. The next prime is 28181129. The reversal of 28181122 is 22118182.

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., 16008001 + 12173121 = 4001^2 + 3489^2 .

It is not an unprimeable number, because it can be changed into a prime (28181129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7045279 + ... + 7045282.

Almost surely, 2^28181122 is an apocalyptic number.

28181122 is a deficient number, since it is larger than the sum of its proper divisors (14090564).

28181122 is a wasteful number, since it uses less digits than its factorization.

28181122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14090563.

The product of its digits is 512, while the sum is 25.

The square root of 28181122 is about 5308.5894548364. The cubic root of 28181122 is about 304.3122441022.

The spelling of 28181122 in words is "twenty-eight million, one hundred eighty-one thousand, one hundred twenty-two".