28122143 has 16 divisors (see below), whose sum is σ = 32928000. Its totient is φ = 23521536.

The previous prime is 28122139. The next prime is 28122161. The reversal of 28122143 is 34122182.

It is a happy number.

It is not a de Polignac number, because 28122143 - 2² = 28122139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28122103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56108 + ... + 56606.

It is an arithmetic number, because the mean of its divisors is an integer number (2058000).

Almost surely, 2^28122143 is an apocalyptic number.

28122143 is a deficient number, since it is larger than the sum of its proper divisors (4805857).

28122143 is an equidigital number, since it uses as much as digits as its factorization.

28122143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686.

The product of its digits is 768, while the sum is 23.

The square root of 28122143 is about 5303.0314915150. The cubic root of 28122143 is about 304.0998020367.

The spelling of 28122143 in words is "twenty-eight million, one hundred twenty-two thousand, one hundred forty-three".