28140808 has 32 divisors (see below), whose sum is σ = 54812160. Its totient is φ = 13530240.

The previous prime is 28140803. The next prime is 28140811. The reversal of 28140808 is 80804182.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 28140808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28140803) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 57541 + ... + 58027.

It is an arithmetic number, because the mean of its divisors is an integer number (1712880).

Almost surely, 2^28140808 is an apocalyptic number.

It is an amenable number.

28140808 is a deficient number, since it is larger than the sum of its proper divisors (26671352).

28140808 is a wasteful number, since it uses less digits than its factorization.

28140808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 28140808 is about 5304.7910420675. The cubic root of 28140808 is about 304.1670653734.

The spelling of 28140808 in words is "twenty-eight million, one hundred forty thousand, eight hundred eight".