16768881 has 18 divisors (see below), whose sum is σ = 24912342. Its totient is φ = 10869120.

The previous prime is 16768867. The next prime is 16768891. The reversal of 16768881 is 18886761.

It can be written as a sum of positive squares in 3 ways, for example, as 6426225 + 10342656 = 2535^2 + 3216^2 .

It is not a de Polignac number, because 16768881 - 2⁹ = 16768369 is a prime.

It is a super-2 number, since 2×16768881² = 562390739984322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16768831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11641 + ... + 13001.

It is an arithmetic number, because the mean of its divisors is an integer number (1384019).

Almost surely, 2^16768881 is an apocalyptic number.

It is an amenable number.

16768881 is a deficient number, since it is larger than the sum of its proper divisors (8143461).

16768881 is a wasteful number, since it uses less digits than its factorization.

16768881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441 (or 1401 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 16768881 is about 4094.9824175447. The cubic root of 16768881 is about 255.9575989753.

The spelling of 16768881 in words is "sixteen million, seven hundred sixty-eight thousand, eight hundred eighty-one".