28171402765 has 32 divisors (see below), whose sum is σ = 37406707200. Its totient is φ = 20195934720.

The previous prime is 28171402759. The next prime is 28171402781. The reversal of 28171402765 is 56720417182.

It is not a de Polignac number, because 28171402765 - 2¹¹ = 28171400717 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2832321 + ... + 2842249.

It is an arithmetic number, because the mean of its divisors is an integer number (1168959600).

Almost surely, 2^28171402765 is an apocalyptic number.

It is an amenable number.

28171402765 is a deficient number, since it is larger than the sum of its proper divisors (9235304435).

28171402765 is a wasteful number, since it uses less digits than its factorization.

28171402765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10677.

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 28171402765 in words is "twenty-eight billion, one hundred seventy-one million, four hundred two thousand, seven hundred sixty-five".