28140488 has 8 divisors (see below), whose sum is σ = 52763430. Its totient is φ = 14070240.

The previous prime is 28140487. The next prime is 28140493. The reversal of 28140488 is 88404182.

It can be written as a sum of positive squares in only one way, i.e., 14730244 + 13410244 = 3838^2 + 3662^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28140487) by changing a digit.

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 as a sum of consecutive naturals, namely, 1758773 + ... + 1758788.

Almost surely, 2^28140488 is an apocalyptic number.

It is an amenable number.

28140488 is a deficient number, since it is larger than the sum of its proper divisors (24622942).

28140488 is a wasteful number, since it uses less digits than its factorization.

28140488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517567 (or 3517563 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 28140488 is about 5304.7608805676. The cubic root of 28140488 is about 304.1659124353.

The spelling of 28140488 in words is "twenty-eight million, one hundred forty thousand, four hundred eighty-eight".