28516481 has 12 divisors (see below), whose sum is σ = 34615872. Its totient is φ = 23379048.

The previous prime is 28516459. The next prime is 28516489. The reversal of 28516481 is 18461582.

It is not a de Polignac number, because 28516481 - 2¹⁸ = 28254337 is a prime.

It is a super-2 number, since 2×28516481² = 1626379377246722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28516489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11525 + ... + 13778.

It is an arithmetic number, because the mean of its divisors is an integer number (2884656).

Almost surely, 2^28516481 is an apocalyptic number.

It is an amenable number.

28516481 is a deficient number, since it is larger than the sum of its proper divisors (6099391).

28516481 is a wasteful number, since it uses less digits than its factorization.

28516481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25340 (or 25333 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 28516481 is about 5340.0824899996. The cubic root of 28516481 is about 305.5146055878.

The spelling of 28516481 in words is "twenty-eight million, five hundred sixteen thousand, four hundred eighty-one".