28089660 has 48 divisors (see below), whose sum is σ = 80783136. Its totient is φ = 7287552.

The previous prime is 28089643. The next prime is 28089667. The reversal of 28089660 is 6698082.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28089667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4107 + ... + 8546.

It is an arithmetic number, because the mean of its divisors is an integer number (1682982).

Almost surely, 2^28089660 is an apocalyptic number.

28089660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28089660 is an abundant number, since it is smaller than the sum of its proper divisors (52693476).

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

28089660 is a wasteful number, since it uses less digits than its factorization.

28089660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12702 (or 12700 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 28089660 is about 5299.9679244312. The cubic root of 28089660 is about 303.9826715654.

The spelling of 28089660 in words is "twenty-eight million, eighty-nine thousand, six hundred sixty".