28816871525 has 48 divisors (see below), whose sum is σ = 40780046160. Its totient is φ = 20044953600.

The previous prime is 28816871507. The next prime is 28816871533. The reversal of 28816871525 is 52517861882.

It can be written as a sum of positive squares in 24 ways, for example, as 26535758404 + 2281113121 = 162898^2 + 47761^2 .

It is not a de Polignac number, because 28816871525 - 2²⁰ = 28815822949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 349139 + ... + 423711.

It is an arithmetic number, because the mean of its divisors is an integer number (849584295).

Almost surely, 2^28816871525 is an apocalyptic number.

28816871525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28816871525 is a deficient number, since it is larger than the sum of its proper divisors (11963174635).

28816871525 is a wasteful number, since it uses less digits than its factorization.

28816871525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74666 (or 74661 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 53.

The spelling of 28816871525 in words is "twenty-eight billion, eight hundred sixteen million, eight hundred seventy-one thousand, five hundred twenty-five".