28550686 has 4 divisors (see below), whose sum is σ = 42826032. Its totient is φ = 14275342.

The previous prime is 28550677. The next prime is 28550699. The reversal of 28550686 is 68605582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68605582 = 2 ⋅34302791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7137670 + ... + 7137673.

It is an arithmetic number, because the mean of its divisors is an integer number (10706508).

Almost surely, 2^28550686 is an apocalyptic number.

28550686 is a deficient number, since it is larger than the sum of its proper divisors (14275346).

28550686 is a wasteful number, since it uses less digits than its factorization.

28550686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14275345.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 28550686 is about 5343.2841960727. The cubic root of 28550686 is about 305.6367098500.

The spelling of 28550686 in words is "twenty-eight million, five hundred fifty thousand, six hundred eighty-six".