28106857801 has 9 divisors (see below), whose sum is σ = 30896341959. Its totient is φ = 25550012400.

The previous prime is 28106857771. The next prime is 28106857813. The reversal of 28106857801 is 10875860182.

The square root of 28106857801 is 167651.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 22245424201 + 5861433600 = 149149^2 + 76560^2 .

It is not a de Polignac number, because 28106857801 - 2¹¹ = 28106855753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28106857001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1836541 + ... + 1851781.

Almost surely, 2^28106857801 is an apocalyptic number.

28106857801 is the 167651-st square number.

28106857801 is the 83826-th centered octagonal number.

It is an amenable number.

28106857801 is a deficient number, since it is larger than the sum of its proper divisors (2789484158).

28106857801 is an frugal number, since it uses more digits than its factorization.

28106857801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30504 (or 15252 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 46.

The spelling of 28106857801 in words is "twenty-eight billion, one hundred six million, eight hundred fifty-seven thousand, eight hundred one".