28528615 has 8 divisors (see below), whose sum is σ = 34282080. Its totient is φ = 22791072.

The previous prime is 28528609. The next prime is 28528639. The reversal of 28528615 is 51682582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28528615 - 2³ = 28528607 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406 + ... + 7564.

It is an arithmetic number, because the mean of its divisors is an integer number (4285260).

Almost surely, 2^28528615 is an apocalyptic number.

28528615 is a deficient number, since it is larger than the sum of its proper divisors (5753465).

28528615 is an equidigital number, since it uses as much as digits as its factorization.

28528615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7961.

The product of its digits is 38400, while the sum is 37.

The square root of 28528615 is about 5341.2184939394. The cubic root of 28528615 is about 305.5579324455.

It can be divided in two parts, 285 and 28615, that added together give a square (28900 = 170²).

The spelling of 28528615 in words is "twenty-eight million, five hundred twenty-eight thousand, six hundred fifteen".