28055660 has 24 divisors (see below), whose sum is σ = 59630256. Its totient is φ = 11086400.

The previous prime is 28055659. The next prime is 28055681. The reversal of 28055660 is 6655082.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6791 + ... + 10110.

It is an arithmetic number, because the mean of its divisors is an integer number (2484594).

Almost surely, 2^28055660 is an apocalyptic number.

28055660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28055660 is an abundant number, since it is smaller than the sum of its proper divisors (31574596).

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

28055660 is a wasteful number, since it uses less digits than its factorization.

28055660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16993 (or 16991 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 28055660 is about 5296.7593866439. The cubic root of 28055660 is about 303.8599741782.

The spelling of 28055660 in words is "twenty-eight million, fifty-five thousand, six hundred sixty".