28680786 has 12 divisors (see below), whose sum is σ = 62141742. Its totient is φ = 9560256.

The previous prime is 28680781. The next prime is 28680811. The reversal of 28680786 is 68708682.

It can be written as a sum of positive squares in only one way, i.e., 28676025 + 4761 = 5355^2 + 69^2 .

It is not an unprimeable number, because it can be changed into a prime (28680781) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 796671 + ... + 796706.

Almost surely, 2^28680786 is an apocalyptic number.

28680786 is an abundant number, since it is smaller than the sum of its proper divisors (33460956).

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

28680786 is a wasteful number, since it uses less digits than its factorization.

28680786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593385 (or 1593382 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 28680786 is about 5355.4445193653. Note that the first 3 decimals coincide. The cubic root of 28680786 is about 306.1002490965.

The spelling of 28680786 in words is "twenty-eight million, six hundred eighty thousand, seven hundred eighty-six".