28571147 has 4 divisors (see below), whose sum is σ = 31168536. Its totient is φ = 25973760.

The previous prime is 28571143. The next prime is 28571149. The reversal of 28571147 is 74117582.

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

It is a cyclic number.

It is not a de Polignac number, because 28571147 - 2² = 28571143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28571143) 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, 1298678 + ... + 1298699.

It is an arithmetic number, because the mean of its divisors is an integer number (7792134).

Almost surely, 2^28571147 is an apocalyptic number.

28571147 is a deficient number, since it is larger than the sum of its proper divisors (2597389).

28571147 is a wasteful number, since it uses less digits than its factorization.

28571147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2597388.

The product of its digits is 15680, while the sum is 35.

The square root of 28571147 is about 5345.1984995882. The cubic root of 28571147 is about 305.7097044699.

It can be divided in two parts, 2857 and 1147, that added together give a palindrome (4004).

The spelling of 28571147 in words is "twenty-eight million, five hundred seventy-one thousand, one hundred forty-seven".