28125575 has 12 divisors (see below), whose sum is σ = 35449368. Its totient is φ = 22130400.

The previous prime is 28125557. The next prime is 28125577. The reversal of 28125575 is 57552182.

It is not a de Polignac number, because 28125575 - 2⁶ = 28125511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28125577) 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, 7697 + ... + 10746.

It is an arithmetic number, because the mean of its divisors is an integer number (2954114).

Almost surely, 2^28125575 is an apocalyptic number.

28125575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28125575 is a deficient number, since it is larger than the sum of its proper divisors (7323793).

28125575 is a wasteful number, since it uses less digits than its factorization.

28125575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18514 (or 18509 counting only the distinct ones).

The product of its digits is 28000, while the sum is 35.

The square root of 28125575 is about 5303.3550701419. The cubic root of 28125575 is about 304.1121722186.

The spelling of 28125575 in words is "twenty-eight million, one hundred twenty-five thousand, five hundred seventy-five".