28515528 has 48 divisors (see below), whose sum is σ = 81775980. Its totient is φ = 8945664.

The previous prime is 28515491. The next prime is 28515559. The reversal of 28515528 is 82551582.

It can be written as a sum of positive squares in 2 ways, for example, as 28323684 + 191844 = 5322^2 + 438^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28515492 and 28515501.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10425 + ... + 12872.

Almost surely, 2^28515528 is an apocalyptic number.

It is an amenable number.

28515528 is an abundant number, since it is smaller than the sum of its proper divisors (53260452).

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

28515528 is a wasteful number, since it uses less digits than its factorization.

28515528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23326 (or 23319 counting only the distinct ones).

The product of its digits is 32000, while the sum is 36.

The square root of 28515528 is about 5339.9932584227. The cubic root of 28515528 is about 305.5112021915.

The spelling of 28515528 in words is "twenty-eight million, five hundred fifteen thousand, five hundred twenty-eight".