28277287 has 4 divisors (see below), whose sum is σ = 29041576. Its totient is φ = 27513000.

The previous prime is 28277269. The next prime is 28277297. The reversal of 28277287 is 78277282.

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 28277287 - 2¹¹ = 28275239 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 (28277257) 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, 382089 + ... + 382162.

It is an arithmetic number, because the mean of its divisors is an integer number (7260394).

Almost surely, 2^28277287 is an apocalyptic number.

28277287 is a deficient number, since it is larger than the sum of its proper divisors (764289).

28277287 is an equidigital number, since it uses as much as digits as its factorization.

28277287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764288.

The product of its digits is 175616, while the sum is 43.

The square root of 28277287 is about 5317.6392318396. The cubic root of 28277287 is about 304.6579952162.

The spelling of 28277287 in words is "twenty-eight million, two hundred seventy-seven thousand, two hundred eighty-seven".