28027555525 has 12 divisors (see below), whose sum is σ = 34760972452. Its totient is φ = 22417655040.

The previous prime is 28027555511. The next prime is 28027555561. The reversal of 28027555525 is 52555572082.

It can be written as a sum of positive squares in 6 ways, for example, as 583657281 + 27443898244 = 24159^2 + 165662^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28027555525 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23707 + ... + 237943.

Almost surely, 2^28027555525 is an apocalyptic number.

28027555525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28027555525 is a deficient number, since it is larger than the sum of its proper divisors (6733416927).

28027555525 is a wasteful number, since it uses less digits than its factorization.

28027555525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219480 (or 219475 counting only the distinct ones).

The product of its (nonzero) digits is 1400000, while the sum is 46.

The spelling of 28027555525 in words is "twenty-eight billion, twenty-seven million, five hundred fifty-five thousand, five hundred twenty-five".