16779745 has 4 divisors (see below), whose sum is σ = 20135700. Its totient is φ = 13423792.

The previous prime is 16779743. The next prime is 16779751. The reversal of 16779745 is 54797761.

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 7144929 + 9634816 = 2673^2 + 3104^2 .

It is a cyclic number.

It is not a de Polignac number, because 16779745 - 2¹ = 16779743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16779695 and 16779704.

It is not an unprimeable number, because it can be changed into a prime (16779743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1677970 + ... + 1677979.

It is an arithmetic number, because the mean of its divisors is an integer number (5033925).

Almost surely, 2^16779745 is an apocalyptic number.

It is an amenable number.

16779745 is a deficient number, since it is larger than the sum of its proper divisors (3355955).

16779745 is an equidigital number, since it uses as much as digits as its factorization.

16779745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3355954.

The product of its digits is 370440, while the sum is 46.

The square root of 16779745 is about 4096.3087041872. The cubic root of 16779745 is about 256.0128625129.

The spelling of 16779745 in words is "sixteen million, seven hundred seventy-nine thousand, seven hundred forty-five".