28122890 has 32 divisors (see below), whose sum is σ = 52932096. Its totient is φ = 10745280.

The previous prime is 28122889. The next prime is 28122893. The reversal of 28122890 is 9822182.

It is not an unprimeable number, because it can be changed into a prime (28122893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25184 + ... + 26276.

It is an arithmetic number, because the mean of its divisors is an integer number (1654128).

Almost surely, 2^28122890 is an apocalyptic number.

28122890 is a deficient number, since it is larger than the sum of its proper divisors (24809206).

28122890 is a wasteful number, since it uses less digits than its factorization.

28122890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 28122890 is about 5303.1019224601. The cubic root of 28122890 is about 304.1024945833.

The spelling of 28122890 in words is "twenty-eight million, one hundred twenty-two thousand, eight hundred ninety".