28316777 has 4 divisors (see below), whose sum is σ = 28434516. Its totient is φ = 28199040.

The previous prime is 28316711. The next prime is 28316779. The reversal of 28316777 is 77761382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14891881 + 13424896 = 3859^2 + 3664^2 .

It is a cyclic number.

It is not a de Polignac number, because 28316777 - 2⁸ = 28316521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28316779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58508 + ... + 58989.

It is an arithmetic number, because the mean of its divisors is an integer number (7108629).

Almost surely, 2^28316777 is an apocalyptic number.

It is an amenable number.

28316777 is a deficient number, since it is larger than the sum of its proper divisors (117739).

28316777 is a wasteful number, since it uses less digits than its factorization.

28316777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117738.

The product of its digits is 98784, while the sum is 41.

The square root of 28316777 is about 5321.3510502503. The cubic root of 28316777 is about 304.7997503058.

The spelling of 28316777 in words is "twenty-eight million, three hundred sixteen thousand, seven hundred seventy-seven".