28886720 has 28 divisors (see below), whose sum is σ = 68787264. Its totient is φ = 11554560.

The previous prime is 28886719. The next prime is 28886731. The reversal of 28886720 is 2768882.

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 3 ways as a sum of consecutive naturals, for example, 44816 + ... + 45455.

It is an arithmetic number, because the mean of its divisors is an integer number (2456688).

Almost surely, 2^28886720 is an apocalyptic number.

28886720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28886720 is an abundant number, since it is smaller than the sum of its proper divisors (39900544).

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

28886720 is an equidigital number, since it uses as much as digits as its factorization.

28886720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90288 (or 90278 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 28886720 is about 5374.6367319104. The cubic root of 28886720 is about 306.8311237206.

The spelling of 28886720 in words is "twenty-eight million, eight hundred eighty-six thousand, seven hundred twenty".