28108660 has 24 divisors (see below), whose sum is σ = 59640840. Its totient is φ = 11126784.

The previous prime is 28108649. The next prime is 28108673. The reversal of 28108660 is 6680182.

It can be written as a sum of positive squares in 4 ways, for example, as 272484 + 27836176 = 522^2 + 5276^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5305 + ... + 9184.

It is an arithmetic number, because the mean of its divisors is an integer number (2485035).

Almost surely, 2^28108660 is an apocalyptic number.

28108660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28108660 is an abundant number, since it is smaller than the sum of its proper divisors (31532180).

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

28108660 is a wasteful number, since it uses less digits than its factorization.

28108660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14595 (or 14593 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 28108660 is about 5301.7600851038. The cubic root of 28108660 is about 304.0511946330.

The spelling of 28108660 in words is "twenty-eight million, one hundred eight thousand, six hundred sixty".