28123872 has 48 divisors (see below), whose sum is σ = 84373632. Its totient is φ = 8035200.

The previous prime is 28123861. The next prime is 28123873. The reversal of 28123872 is 27832182.

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28123873) 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, 20254 + ... + 21597.

It is an arithmetic number, because the mean of its divisors is an integer number (1757784).

Almost surely, 2^28123872 is an apocalyptic number.

It is an amenable number.

28123872 is an abundant number, since it is smaller than the sum of its proper divisors (56249760).

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

28123872 is a wasteful number, since it uses less digits than its factorization.

28123872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41871 (or 41863 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 28123872 is about 5303.1945089729. The cubic root of 28123872 is about 304.1060341102.

The spelling of 28123872 in words is "twenty-eight million, one hundred twenty-three thousand, eight hundred seventy-two".