28777847 has 6 divisors (see below), whose sum is σ = 33476328. Its totient is φ = 24666684.

The previous prime is 28777817. The next prime is 28777877. The reversal of 28777847 is 74877782.

It is an interprime number because it is at equal distance from previous prime (28777817) and next prime (28777877).

It is not a de Polignac number, because 28777847 - 2⁶ = 28777783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28777795 and 28777804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28777817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293603 + ... + 293700.

It is an arithmetic number, because the mean of its divisors is an integer number (5579388).

Almost surely, 2^28777847 is an apocalyptic number.

28777847 is a deficient number, since it is larger than the sum of its proper divisors (4698481).

28777847 is an equidigital number, since it uses as much as digits as its factorization.

28777847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587317 (or 587310 counting only the distinct ones).

The product of its digits is 1229312, while the sum is 50.

The square root of 28777847 is about 5364.4987650292. The cubic root of 28777847 is about 306.4451599603.

The spelling of 28777847 in words is "twenty-eight million, seven hundred seventy-seven thousand, eight hundred forty-seven".