28686877 has 8 divisors (see below), whose sum is σ = 29769656. Its totient is φ = 27620352.

The previous prime is 28686869. The next prime is 28686881. The reversal of 28686877 is 77868682.

It can be written as a sum of positive squares in 4 ways, for example, as 3426201 + 25260676 = 1851^2 + 5026^2 .

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

It is not a de Polignac number, because 28686877 - 2³ = 28686869 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 (28686817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408 + ... + 7585.

It is an arithmetic number, because the mean of its divisors is an integer number (3721207).

Almost surely, 2^28686877 is an apocalyptic number.

It is an amenable number.

28686877 is a deficient number, since it is larger than the sum of its proper divisors (1082779).

28686877 is an equidigital number, since it uses as much as digits as its factorization.

28686877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8127.

The product of its digits is 1806336, while the sum is 52.

The square root of 28686877 is about 5356.0131627919. The cubic root of 28686877 is about 306.1219166181.

The spelling of 28686877 in words is "twenty-eight million, six hundred eighty-six thousand, eight hundred seventy-seven".