28870271 has 4 divisors (see below), whose sum is σ = 28985544. Its totient is φ = 28755000.

The previous prime is 28870241. The next prime is 28870279. The reversal of 28870271 is 17207882.

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 28870271 - 2¹⁴ = 28853887 is a prime.

It is a super-2 number, since 2×28870271² = 1666985095226882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28870279) 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, 57260 + ... + 57761.

It is an arithmetic number, because the mean of its divisors is an integer number (7246386).

Almost surely, 2^28870271 is an apocalyptic number.

28870271 is a deficient number, since it is larger than the sum of its proper divisors (115273).

28870271 is a wasteful number, since it uses less digits than its factorization.

28870271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115272.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 28870271 is about 5373.1062710503. The cubic root of 28870271 is about 306.7728729230.

The spelling of 28870271 in words is "twenty-eight million, eight hundred seventy thousand, two hundred seventy-one".