28024281 has 24 divisors (see below), whose sum is σ = 43392960. Its totient is φ = 17382816.

The previous prime is 28024277. The next prime is 28024289. The reversal of 28024281 is 18242082.

It is not a de Polignac number, because 28024281 - 2² = 28024277 is a prime.

It is a super-2 number, since 2×28024281² = 1570720651133922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28024289) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5830 + ... + 9488.

It is an arithmetic number, because the mean of its divisors is an integer number (1808040).

Almost surely, 2^28024281 is an apocalyptic number.

It is an amenable number.

28024281 is a deficient number, since it is larger than the sum of its proper divisors (15368679).

28024281 is a wasteful number, since it uses less digits than its factorization.

28024281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725 (or 3722 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28024281 is about 5293.7964637866. The cubic root of 28024281 is about 303.7466473237.

The spelling of 28024281 in words is "twenty-eight million, twenty-four thousand, two hundred eighty-one".