28287061 has 4 divisors (see below), whose sum is σ = 30858624. Its totient is φ = 25715500.

The previous prime is 28287059. The next prime is 28287071. The reversal of 28287061 is 16078282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28287061 - 2¹ = 28287059 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 (28287071) 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, 1285765 + ... + 1285786.

It is an arithmetic number, because the mean of its divisors is an integer number (7714656).

Almost surely, 2^28287061 is an apocalyptic number.

It is an amenable number.

28287061 is a deficient number, since it is larger than the sum of its proper divisors (2571563).

28287061 is a wasteful number, since it uses less digits than its factorization.

28287061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571562.

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

The square root of 28287061 is about 5318.5581692786. The cubic root of 28287061 is about 304.6930926924.

It can be divided in two parts, 2828 and 7061, that added together give a palindrome (9889).

The spelling of 28287061 in words is "twenty-eight million, two hundred eighty-seven thousand, sixty-one".