28286071 has 4 divisors (see below), whose sum is σ = 30857544. Its totient is φ = 25714600.

The previous prime is 28286053. The next prime is 28286077. The reversal of 28286071 is 17068282.

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 28286071 - 2⁵ = 28286039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28286077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1285720 + ... + 1285741.

It is an arithmetic number, because the mean of its divisors is an integer number (7714386).

Almost surely, 2^28286071 is an apocalyptic number.

28286071 is a deficient number, since it is larger than the sum of its proper divisors (2571473).

28286071 is a wasteful number, since it uses less digits than its factorization.

28286071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571472.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 28286071 is about 5318.4650981275. The cubic root of 28286071 is about 304.6895380675.

The spelling of 28286071 in words is "twenty-eight million, two hundred eighty-six thousand, seventy-one".