28907144 has 16 divisors (see below), whose sum is σ = 61944000. Its totient is φ = 12388752.

The previous prime is 28907117. The next prime is 28907149. The reversal of 28907144 is 44170982.

It is not an unprimeable number, because it can be changed into a prime (28907149) 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 3 ways as a sum of consecutive naturals, for example, 258044 + ... + 258155.

It is an arithmetic number, because the mean of its divisors is an integer number (3871500).

Almost surely, 2^28907144 is an apocalyptic number.

It is an amenable number.

28907144 is an abundant number, since it is smaller than the sum of its proper divisors (33036856).

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

28907144 is a wasteful number, since it uses less digits than its factorization.

28907144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516212 (or 516208 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28907144 is about 5376.5364315700. The cubic root of 28907144 is about 306.9034204082.

The spelling of 28907144 in words is "twenty-eight million, nine hundred seven thousand, one hundred forty-four".