28871777 has 8 divisors (see below), whose sum is σ = 31624992. Its totient is φ = 26140000.

The previous prime is 28871767. The next prime is 28871779. The reversal of 28871777 is 77717882.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28871777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28871779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2468 + ... + 7989.

It is an arithmetic number, because the mean of its divisors is an integer number (3953124).

Almost surely, 2^28871777 is an apocalyptic number.

It is an amenable number.

28871777 is a deficient number, since it is larger than the sum of its proper divisors (2753215).

28871777 is a wasteful number, since it uses less digits than its factorization.

28871777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10719.

The product of its digits is 307328, while the sum is 47.

The square root of 28871777 is about 5373.2464116212. The cubic root of 28871777 is about 306.7782070366.

It can be divided in two parts, 2887 and 1777, that added together give a palindrome (4664).

The spelling of 28871777 in words is "twenty-eight million, eight hundred seventy-one thousand, seven hundred seventy-seven".