28142947 has 16 divisors (see below), whose sum is σ = 33841152. Its totient is φ = 22894560.

The previous prime is 28142929. The next prime is 28142953. The reversal of 28142947 is 74924182.

It is a cyclic number.

It is not a de Polignac number, because 28142947 - 2¹⁵ = 28110179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28142447) 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, 10278 + ... + 12724.

It is an arithmetic number, because the mean of its divisors is an integer number (2115072).

Almost surely, 2^28142947 is an apocalyptic number.

28142947 is a deficient number, since it is larger than the sum of its proper divisors (5698205).

28142947 is a wasteful number, since it uses less digits than its factorization.

28142947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538.

The product of its digits is 32256, while the sum is 37.

The square root of 28142947 is about 5304.9926484398. The cubic root of 28142947 is about 304.1747718196.

The spelling of 28142947 in words is "twenty-eight million, one hundred forty-two thousand, nine hundred forty-seven".