28857427 has 4 divisors (see below), whose sum is σ = 28868400. Its totient is φ = 28846456.

The previous prime is 28857421. The next prime is 28857443. The reversal of 28857427 is 72475882.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 72475882 = 2 ⋅36237941.

It is a cyclic number.

It is not a de Polignac number, because 28857427 - 2³ = 28857419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28857421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074 + ... + 7672.

It is an arithmetic number, because the mean of its divisors is an integer number (7217100).

Almost surely, 2^28857427 is an apocalyptic number.

28857427 is a deficient number, since it is larger than the sum of its proper divisors (10973).

28857427 is an equidigital number, since it uses as much as digits as its factorization.

28857427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10972.

The product of its digits is 250880, while the sum is 43.

The square root of 28857427 is about 5371.9109262906. The cubic root of 28857427 is about 306.7273731164.

The spelling of 28857427 in words is "twenty-eight million, eight hundred fifty-seven thousand, four hundred twenty-seven".