28277747 has 4 divisors (see below), whose sum is σ = 28290336. Its totient is φ = 28265160.

The previous prime is 28277737. The next prime is 28277773. The reversal of 28277747 is 74777282.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28277747 - 2¹⁰ = 28276723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28277698 and 28277707.

It is not an unprimeable number, because it can be changed into a prime (28277707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1904 + ... + 7757.

It is an arithmetic number, because the mean of its divisors is an integer number (7072584).

Almost surely, 2^28277747 is an apocalyptic number.

28277747 is a deficient number, since it is larger than the sum of its proper divisors (12589).

28277747 is an equidigital number, since it uses as much as digits as its factorization.

28277747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12588.

The product of its digits is 307328, while the sum is 44.

The square root of 28277747 is about 5317.6824839398. The cubic root of 28277747 is about 304.6596472124.

The spelling of 28277747 in words is "twenty-eight million, two hundred seventy-seven thousand, seven hundred forty-seven".