28127286 has 24 divisors (see below), whose sum is σ = 66483144. Its totient is φ = 8523360.

The previous prime is 28127273. The next prime is 28127327. The reversal of 28127286 is 68272182.

It is a happy number.

It is a super-2 number, since 2×28127286² = 1582288435451592, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28127286.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70831 + ... + 71226.

It is an arithmetic number, because the mean of its divisors is an integer number (2770131).

Almost surely, 2^28127286 is an apocalyptic number.

28127286 is an abundant number, since it is smaller than the sum of its proper divisors (38355858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28127286 is a wasteful number, since it uses less digits than its factorization.

28127286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142076 (or 142073 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 28127286 is about 5303.5163806667. The cubic root of 28127286 is about 304.1183389118.

Subtracting 28127286 from its reverse (68272182), we obtain a square (40144896 = 6336²).

The spelling of 28127286 in words is "twenty-eight million, one hundred twenty-seven thousand, two hundred eighty-six".