28753280 has 32 divisors (see below), whose sum is σ = 68739840. Its totient is φ = 11501056.

The previous prime is 28753279. The next prime is 28753339. The reversal of 28753280 is 8235782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×28753280² = 1653502221516800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28753280.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 21824 + ... + 23103.

It is an arithmetic number, because the mean of its divisors is an integer number (2148120).

Almost surely, 2^28753280 is an apocalyptic number.

28753280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28753280 is an abundant number, since it is smaller than the sum of its proper divisors (39986560).

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

28753280 is an equidigital number, since it uses as much as digits as its factorization.

28753280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44946 (or 44934 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28753280 is about 5362.2085002357. The cubic root of 28753280 is about 306.3579333568.

The spelling of 28753280 in words is "twenty-eight million, seven hundred fifty-three thousand, two hundred eighty".