16868777 has 4 divisors (see below), whose sum is σ = 17861076. Its totient is φ = 15876480.

The previous prime is 16868773. The next prime is 16868783. The reversal of 16868777 is 77786861.

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 14295961 + 2572816 = 3781^2 + 1604^2 .

It is a cyclic number.

It is not a de Polignac number, because 16868777 - 2² = 16868773 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16868773) 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, 496124 + ... + 496157.

It is an arithmetic number, because the mean of its divisors is an integer number (4465269).

Almost surely, 2^16868777 is an apocalyptic number.

16868777 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16868777 is a deficient number, since it is larger than the sum of its proper divisors (992299).

16868777 is an equidigital number, since it uses as much as digits as its factorization.

16868777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992298.

The product of its digits is 790272, while the sum is 50.

The square root of 16868777 is about 4107.1616720066. The cubic root of 16868777 is about 256.4648587018.

The spelling of 16868777 in words is "sixteen million, eight hundred sixty-eight thousand, seven hundred seventy-seven".