28023144 has 32 divisors (see below), whose sum is σ = 70455840. Its totient is φ = 9288000.

The previous prime is 28023133. The next prime is 28023169. The reversal of 28023144 is 44132082.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1119 + ... + 7569.

It is an arithmetic number, because the mean of its divisors is an integer number (2201745).

Almost surely, 2^28023144 is an apocalyptic number.

28023144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28023144 is an abundant number, since it is smaller than the sum of its proper divisors (42432696).

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

28023144 is a wasteful number, since it uses less digits than its factorization.

28023144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6641 (or 6637 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 28023144 is about 5293.6890728489. The cubic root of 28023144 is about 303.7425394025.

The spelling of 28023144 in words is "twenty-eight million, twenty-three thousand, one hundred forty-four".