28026660 has 48 divisors (see below), whose sum is σ = 78829632. Its totient is φ = 7440000.

The previous prime is 28026643. The next prime is 28026679. The reversal of 28026660 is 6662082.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14130 + ... + 15990.

It is an arithmetic number, because the mean of its divisors is an integer number (1642284).

Almost surely, 2^28026660 is an apocalyptic number.

28026660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28026660 is an abundant number, since it is smaller than the sum of its proper divisors (50802972).

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

28026660 is a wasteful number, since it uses less digits than its factorization.

28026660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124 (or 2122 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28026660 is about 5294.0211559834. The cubic root of 28026660 is about 303.7552421660.

The spelling of 28026660 in words is "twenty-eight million, twenty-six thousand, six hundred sixty".