28406686 has 48 divisors (see below), whose sum is σ = 54966240. Its totient is φ = 10771200.

The previous prime is 28406647. The next prime is 28406699. The reversal of 28406686 is 68660482.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69250 + ... + 69658.

It is an arithmetic number, because the mean of its divisors is an integer number (1145130).

Almost surely, 2^28406686 is an apocalyptic number.

28406686 is a deficient number, since it is larger than the sum of its proper divisors (26559554).

28406686 is a wasteful number, since it uses less digits than its factorization.

28406686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 28406686 is about 5329.7923036456. The cubic root of 28406686 is about 305.1220008211.

It can be divided in two parts, 28406 and 686, that added together give a palindrome (29092).

The spelling of 28406686 in words is "twenty-eight million, four hundred six thousand, six hundred eighty-six".