28733171805 has 24 divisors (see below), whose sum is σ = 53635255128. Its totient is φ = 14145561216.

The previous prime is 28733171777. The next prime is 28733171813. The reversal of 28733171805 is 50817133782.

It can be written as a sum of positive squares in 4 ways, for example, as 1061847396 + 27671324409 = 32586^2 + 166347^2 .

It is not a de Polignac number, because 28733171805 - 2⁸ = 28733171549 is a prime.

It is a super-4 number, since 4×28733171805⁴ (a number of 43 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24557682 + ... + 24558851.

It is an arithmetic number, because the mean of its divisors is an integer number (2234802297).

Almost surely, 2^28733171805 is an apocalyptic number.

It is an amenable number.

28733171805 is a deficient number, since it is larger than the sum of its proper divisors (24902083323).

28733171805 is a wasteful number, since it uses less digits than its factorization.

28733171805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49116557 (or 49116554 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 28733171805 in words is "twenty-eight billion, seven hundred thirty-three million, one hundred seventy-one thousand, eight hundred five".