28605686 has 4 divisors (see below), whose sum is σ = 42908532. Its totient is φ = 14302842.

The previous prime is 28605683. The next prime is 28605691. The reversal of 28605686 is 68650682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68650682 = 2 ⋅34325341.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28605683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7151420 + ... + 7151423.

It is an arithmetic number, because the mean of its divisors is an integer number (10727133).

Almost surely, 2^28605686 is an apocalyptic number.

28605686 is a deficient number, since it is larger than the sum of its proper divisors (14302846).

28605686 is a wasteful number, since it uses less digits than its factorization.

28605686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14302845.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 28605686 is about 5348.4283672870. The cubic root of 28605686 is about 305.8328433313.

The spelling of 28605686 in words is "twenty-eight million, six hundred five thousand, six hundred eighty-six".