28587427 has 4 divisors (see below), whose sum is σ = 31186296. Its totient is φ = 25988560.

The previous prime is 28587407. The next prime is 28587439. The reversal of 28587427 is 72478582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28587427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28587407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1299418 + ... + 1299439.

It is an arithmetic number, because the mean of its divisors is an integer number (7796574).

Almost surely, 2^28587427 is an apocalyptic number.

28587427 is a deficient number, since it is larger than the sum of its proper divisors (2598869).

28587427 is a wasteful number, since it uses less digits than its factorization.

28587427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2598868.

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

The square root of 28587427 is about 5346.7211447765. The cubic root of 28587427 is about 305.7677584802.

The spelling of 28587427 in words is "twenty-eight million, five hundred eighty-seven thousand, four hundred twenty-seven".