28142685 has 24 divisors (see below), whose sum is σ = 50903424. Its totient is φ = 14356320.

The previous prime is 28142663. The next prime is 28142689. The reversal of 28142685 is 58624182.

It is not a de Polignac number, because 28142685 - 2¹⁰ = 28141661 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28142689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12561 + ... + 14630.

It is an arithmetic number, because the mean of its divisors is an integer number (2120976).

Almost surely, 2^28142685 is an apocalyptic number.

It is an amenable number.

28142685 is a deficient number, since it is larger than the sum of its proper divisors (22760739).

28142685 is a wasteful number, since it uses less digits than its factorization.

28142685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27225 (or 27222 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 28142685 is about 5304.9679546629. The cubic root of 28142685 is about 304.1738279000.

The spelling of 28142685 in words is "twenty-eight million, one hundred forty-two thousand, six hundred eighty-five".