28086660 has 72 divisors (see below), whose sum is σ = 97371456. Its totient is φ = 6419520.

The previous prime is 28086659. The next prime is 28086671. The reversal of 28086660 is 6668082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9886 + ... + 12405.

Almost surely, 2^28086660 is an apocalyptic number.

28086660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28086660 is an abundant number, since it is smaller than the sum of its proper divisors (69284796).

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

28086660 is a wasteful number, since it uses less digits than its factorization.

28086660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22313 (or 22308 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 28086660 is about 5299.6848962934. The cubic root of 28086660 is about 303.9718493093.

The spelling of 28086660 in words is "twenty-eight million, eighty-six thousand, six hundred sixty".