16878065 has 4 divisors (see below), whose sum is σ = 20253684. Its totient is φ = 13502448.

The previous prime is 16878047. The next prime is 16878077. The reversal of 16878065 is 56087861.

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 6270016 + 10608049 = 2504^2 + 3257^2 .

It is a cyclic number.

It is not a de Polignac number, because 16878065 - 2¹⁶ = 16812529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1687802 + ... + 1687811.

It is an arithmetic number, because the mean of its divisors is an integer number (5063421).

Almost surely, 2^16878065 is an apocalyptic number.

It is an amenable number.

16878065 is a deficient number, since it is larger than the sum of its proper divisors (3375619).

16878065 is an equidigital number, since it uses as much as digits as its factorization.

16878065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3375618.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 16878065 is about 4108.2922242703. The cubic root of 16878065 is about 256.5119201763.

The spelling of 16878065 in words is "sixteen million, eight hundred seventy-eight thousand, sixty-five".