28121330 has 32 divisors (see below), whose sum is σ = 53913600. Its totient is φ = 10530432.

The previous prime is 28121321. The next prime is 28121351. The reversal of 28121330 is 3312182.

It is an unprimeable number.

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, 16079 + ... + 17741.

It is an arithmetic number, because the mean of its divisors is an integer number (1684800).

Almost surely, 2^28121330 is an apocalyptic number.

28121330 is a deficient number, since it is larger than the sum of its proper divisors (25792270).

28121330 is a wasteful number, since it uses less digits than its factorization.

28121330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 28121330 is about 5302.9548366925. The cubic root of 28121330 is about 304.0968715403.

The spelling of 28121330 in words is "twenty-eight million, one hundred twenty-one thousand, three hundred thirty".