28193660 has 24 divisors (see below), whose sum is σ = 64589616. Its totient is φ = 10252160.

The previous prime is 28193657. The next prime is 28193707. The reversal of 28193660 is 6639182.

It is a self number, because there is not a number n which added to its sum of digits gives 28193660.

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, 63857 + ... + 64296.

It is an arithmetic number, because the mean of its divisors is an integer number (2691234).

Almost surely, 2^28193660 is an apocalyptic number.

28193660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28193660 is an abundant number, since it is smaller than the sum of its proper divisors (36395956).

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

28193660 is a wasteful number, since it uses less digits than its factorization.

28193660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128173 (or 128171 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28193660 is about 5309.7702398503. The cubic root of 28193660 is about 304.3573677044.

The spelling of 28193660 in words is "twenty-eight million, one hundred ninety-three thousand, six hundred sixty".