28122530 has 16 divisors (see below), whose sum is σ = 50851584. Its totient is φ = 11197680.

The previous prime is 28122517. The next prime is 28122533. The reversal of 28122530 is 3522182.

It is a junction number, because it is equal to n+sod(n) for n = 28122496 and 28122505.

It is not an unprimeable number, because it can be changed into a prime (28122533) 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 7 ways as a sum of consecutive naturals, for example, 4076 + ... + 8535.

It is an arithmetic number, because the mean of its divisors is an integer number (3178224).

Almost surely, 2^28122530 is an apocalyptic number.

28122530 is a deficient number, since it is larger than the sum of its proper divisors (22729054).

28122530 is a wasteful number, since it uses less digits than its factorization.

28122530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12841.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 28122530 is about 5303.0679799527. The cubic root of 28122530 is about 304.1011969765.

The spelling of 28122530 in words is "twenty-eight million, one hundred twenty-two thousand, five hundred thirty".