28253787 has 4 divisors (see below), whose sum is σ = 37671720. Its totient is φ = 18835856.

The previous prime is 28253777. The next prime is 28253789. The reversal of 28253787 is 78735282.

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

It is a cyclic number.

It is not a de Polignac number, because 28253787 - 2¹² = 28249691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28253789) 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, 4708962 + ... + 4708967.

It is an arithmetic number, because the mean of its divisors is an integer number (9417930).

Almost surely, 2^28253787 is an apocalyptic number.

28253787 is a deficient number, since it is larger than the sum of its proper divisors (9417933).

28253787 is an equidigital number, since it uses as much as digits as its factorization.

28253787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9417932.

The product of its digits is 188160, while the sum is 42.

The square root of 28253787 is about 5315.4291454218. The cubic root of 28253787 is about 304.5735759069.

The spelling of 28253787 in words is "twenty-eight million, two hundred fifty-three thousand, seven hundred eighty-seven".