26828021677 has 4 divisors (see below), whose sum is σ = 27093645756. Its totient is φ = 26562397600.

The previous prime is 26828021659. The next prime is 26828021699. The reversal of 26828021677 is 77612082862.

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 13544537161 + 13283484516 = 116381^2 + 115254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26828021677 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26828021677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26828021377) 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, 132811888 + ... + 132812089.

It is an arithmetic number, because the mean of its divisors is an integer number (6773411439).

Almost surely, 2^26828021677 is an apocalyptic number.

It is an amenable number.

26828021677 is a deficient number, since it is larger than the sum of its proper divisors (265624079).

26828021677 is a wasteful number, since it uses less digits than its factorization.

26828021677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265624078.

The product of its (nonzero) digits is 903168, while the sum is 49.

The spelling of 26828021677 in words is "twenty-six billion, eight hundred twenty-eight million, twenty-one thousand, six hundred seventy-seven".