28125787 has 4 divisors (see below), whose sum is σ = 28724256. Its totient is φ = 27527320.

The previous prime is 28125781. The next prime is 28125793. The reversal of 28125787 is 78752182.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28125781) and next prime (28125793).

It is a cyclic number.

It is not a de Polignac number, because 28125787 - 2¹⁵ = 28093019 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28125781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299164 + ... + 299257.

It is an arithmetic number, because the mean of its divisors is an integer number (7181064).

Almost surely, 2^28125787 is an apocalyptic number.

28125787 is a deficient number, since it is larger than the sum of its proper divisors (598469).

28125787 is an equidigital number, since it uses as much as digits as its factorization.

28125787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598468.

The product of its digits is 62720, while the sum is 40.

The square root of 28125787 is about 5303.3750574516. The cubic root of 28125787 is about 304.1129363110.

The spelling of 28125787 in words is "twenty-eight million, one hundred twenty-five thousand, seven hundred eighty-seven".