28277855 has 4 divisors (see below), whose sum is σ = 33933432. Its totient is φ = 22622280.

The previous prime is 28277849. The next prime is 28277861. The reversal of 28277855 is 55877282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55877282 = 2 ⋅27938641.

It is an interprime number because it is at equal distance from previous prime (28277849) and next prime (28277861).

It is not a de Polignac number, because 28277855 - 2⁴ = 28277839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2827781 + ... + 2827790.

It is an arithmetic number, because the mean of its divisors is an integer number (8483358).

Almost surely, 2^28277855 is an apocalyptic number.

28277855 is a deficient number, since it is larger than the sum of its proper divisors (5655577).

28277855 is an equidigital number, since it uses as much as digits as its factorization.

28277855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5655576.

The product of its digits is 313600, while the sum is 44.

The square root of 28277855 is about 5317.6926387297. The cubic root of 28277855 is about 304.6600350698.

The spelling of 28277855 in words is "twenty-eight million, two hundred seventy-seven thousand, eight hundred fifty-five".