28906686 has 32 divisors (see below), whose sum is σ = 65125920. Its totient is φ = 9502272.

The previous prime is 28906673. The next prime is 28906687. The reversal of 28906686 is 68660982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28906687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276 + ... + 7608.

It is an arithmetic number, because the mean of its divisors is an integer number (2035185).

Almost surely, 2^28906686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28906686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32562960).

28906686 is an abundant number, since it is smaller than the sum of its proper divisors (36219234).

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

28906686 is a wasteful number, since it uses less digits than its factorization.

28906686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7417 (or 7411 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 28906686 is about 5376.4938389251. The cubic root of 28906686 is about 306.9017995574.

It can be divided in two parts, 28906 and 686, that added together give a palindrome (29592).

The spelling of 28906686 in words is "twenty-eight million, nine hundred six thousand, six hundred eighty-six".