28087575 has 12 divisors (see below), whose sum is σ = 46438248. Its totient is φ = 14980000.

The previous prime is 28087571. The next prime is 28087589. The reversal of 28087575 is 57578082.

It is a happy number.

It is not a de Polignac number, because 28087575 - 2² = 28087571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28087571) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 187176 + ... + 187325.

It is an arithmetic number, because the mean of its divisors is an integer number (3869854).

Almost surely, 2^28087575 is an apocalyptic number.

28087575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28087575 is a deficient number, since it is larger than the sum of its proper divisors (18350673).

28087575 is a wasteful number, since it uses less digits than its factorization.

28087575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374514 (or 374509 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 28087575 is about 5299.7712214774. The cubic root of 28087575 is about 303.9751501791.

The spelling of 28087575 in words is "twenty-eight million, eighty-seven thousand, five hundred seventy-five".