28243471 has 4 divisors (see below), whose sum is σ = 29471472. Its totient is φ = 27015472.

The previous prime is 28243451. The next prime is 28243483. The reversal of 28243471 is 17434282.

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 28243471 - 2⁷ = 28243343 is a prime.

It is a super-3 number, since 3×28243471³ (a number of 23 digits) contains 333 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 (28243441) 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, 613966 + ... + 614011.

It is an arithmetic number, because the mean of its divisors is an integer number (7367868).

Almost surely, 2^28243471 is an apocalyptic number.

28243471 is a deficient number, since it is larger than the sum of its proper divisors (1228001).

28243471 is a wasteful number, since it uses less digits than its factorization.

28243471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228000.

The product of its digits is 10752, while the sum is 31.

The square root of 28243471 is about 5314.4586742207. The cubic root of 28243471 is about 304.5365028414.

The spelling of 28243471 in words is "twenty-eight million, two hundred forty-three thousand, four hundred seventy-one".