28101280 has 24 divisors (see below), whose sum is σ = 66389652. Its totient is φ = 11240448.

The previous prime is 28101263. The next prime is 28101299. The reversal of 28101280 is 8210182.

It can be written as a sum of positive squares in 2 ways, for example, as 27415696 + 685584 = 5236^2 + 828^2 .

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, 87657 + ... + 87976.

Almost surely, 2^28101280 is an apocalyptic number.

28101280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28101280 is an abundant number, since it is smaller than the sum of its proper divisors (38288372).

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

28101280 is a wasteful number, since it uses less digits than its factorization.

28101280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175648 (or 175640 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 28101280 is about 5301.0640441330. The cubic root of 28101280 is about 304.0245824997.

The spelling of 28101280 in words is "twenty-eight million, one hundred one thousand, two hundred eighty".