28261686 has 8 divisors (see below), whose sum is σ = 56523384. Its totient is φ = 9420560.

The previous prime is 28261657. The next prime is 28261693. The reversal of 28261686 is 68616282.

It is a sphenic number, since it is the product of 3 distinct primes.

28261686 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2355135 + ... + 2355146.

It is an arithmetic number, because the mean of its divisors is an integer number (7065423).

Almost surely, 2^28261686 is an apocalyptic number.

28261686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28261686 is a wasteful number, since it uses less digits than its factorization.

28261686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4710286.

The product of its digits is 55296, while the sum is 39.

The square root of 28261686 is about 5316.1721191098. The cubic root of 28261686 is about 304.6019567927.

The spelling of 28261686 in words is "twenty-eight million, two hundred sixty-one thousand, six hundred eighty-six".