28017680 has 40 divisors (see below), whose sum is σ = 67977792. Its totient is φ = 10719104.

The previous prime is 28017677. The next prime is 28017697. The reversal of 28017680 is 8671082.

It is a tau number, because it is divible by the number of its divisors (40).

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, 5774 + ... + 9453.

Almost surely, 2^28017680 is an apocalyptic number.

28017680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28017680 is an abundant number, since it is smaller than the sum of its proper divisors (39960112).

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

28017680 is a wasteful number, since it uses less digits than its factorization.

28017680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15263 (or 15257 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 28017680 is about 5293.1729614665. The cubic root of 28017680 is about 303.7227967080.

The spelling of 28017680 in words is "twenty-eight million, seventeen thousand, six hundred eighty".