28385787 has 4 divisors (see below), whose sum is σ = 37847720. Its totient is φ = 18923856.

The previous prime is 28385783. The next prime is 28385803. The reversal of 28385787 is 78758382.

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

It is not a de Polignac number, because 28385787 - 2² = 28385783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28385783) 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, 4730962 + ... + 4730967.

It is an arithmetic number, because the mean of its divisors is an integer number (9461930).

Almost surely, 2^28385787 is an apocalyptic number.

28385787 is a deficient number, since it is larger than the sum of its proper divisors (9461933).

28385787 is an equidigital number, since it uses as much as digits as its factorization.

28385787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9461932.

The product of its digits is 752640, while the sum is 48.

The square root of 28385787 is about 5327.8313599437. The cubic root of 28385787 is about 305.0471556580.

The spelling of 28385787 in words is "twenty-eight million, three hundred eighty-five thousand, seven hundred eighty-seven".