28131259877 has 32 divisors (see below), whose sum is σ = 33453911040. Its totient is φ = 23153506560.

The previous prime is 28131259867. The next prime is 28131259889. The reversal of 28131259877 is 77895213182.

It is a cyclic number.

It is not a de Polignac number, because 28131259877 - 2¹² = 28131255781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28131259867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7648763 + ... + 7652439.

It is an arithmetic number, because the mean of its divisors is an integer number (1045434720).

Almost surely, 2^28131259877 is an apocalyptic number.

It is an amenable number.

28131259877 is a deficient number, since it is larger than the sum of its proper divisors (5322651163).

28131259877 is a wasteful number, since it uses less digits than its factorization.

28131259877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4101.

The product of its digits is 1693440, while the sum is 53.

The spelling of 28131259877 in words is "twenty-eight billion, one hundred thirty-one million, two hundred fifty-nine thousand, eight hundred seventy-seven".