28515128 has 16 divisors (see below), whose sum is σ = 53996760. Its totient is φ = 14116000.

The previous prime is 28515119. The next prime is 28515139. The reversal of 28515128 is 82151582.

It is a happy number.

It is a super-2 number, since 2×28515128² = 1626225049712768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28515094 and 28515103.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 16838 + ... + 18453.

Almost surely, 2^28515128 is an apocalyptic number.

It is an amenable number.

28515128 is a deficient number, since it is larger than the sum of its proper divisors (25481632).

28515128 is a wasteful number, since it uses less digits than its factorization.

28515128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35398 (or 35394 counting only the distinct ones).

The product of its digits is 6400, while the sum is 32.

The square root of 28515128 is about 5339.9558050606. The cubic root of 28515128 is about 305.5097736709.

The spelling of 28515128 in words is "twenty-eight million, five hundred fifteen thousand, one hundred twenty-eight".