28280880 has 80 divisors (see below), whose sum is σ = 97419360. Its totient is φ = 7540992.

The previous prime is 28280867. The next prime is 28280893. The reversal of 28280880 is 8808282.

It is an interprime number because it is at equal distance from previous prime (28280867) and next prime (28280893).

It is a tau number, because it is divible by the number of its divisors (80).

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

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 15 ways as a sum of consecutive naturals, for example, 4387 + ... + 8706.

It is an arithmetic number, because the mean of its divisors is an integer number (1217742).

Almost surely, 2^28280880 is an apocalyptic number.

28280880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28280880 is an abundant number, since it is smaller than the sum of its proper divisors (69138480).

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

28280880 is a wasteful number, since it uses less digits than its factorization.

28280880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13115 (or 13103 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 36.

The square root of 28280880 is about 5317.9770589953. The cubic root of 28280880 is about 304.6708982670.

The spelling of 28280880 in words is "twenty-eight million, two hundred eighty thousand, eight hundred eighty".