28642086 has 40 divisors (see below), whose sum is σ = 70018344. Its totient is φ = 8678880.

The previous prime is 28642079. The next prime is 28642091. The reversal of 28642086 is 68024682.

28642086 is a `hidden beast` number, since 2 + 8 + 642 + 0 + 8 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 28642086.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6255 + ... + 9818.

Almost surely, 2^28642086 is an apocalyptic number.

28642086 is an abundant number, since it is smaller than the sum of its proper divisors (41376258).

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

28642086 is a wasteful number, since it uses less digits than its factorization.

28642086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16098 (or 16089 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 28642086 is about 5351.8301542556. The cubic root of 28642086 is about 305.9625098245.

It can be divided in two parts, 2864 and 2086, that added together give a triangular number (4950 = T₉₉).

The spelling of 28642086 in words is "twenty-eight million, six hundred forty-two thousand, eighty-six".