28128542571 has 32 divisors (see below), whose sum is σ = 45280204800. Its totient is φ = 17192308320.

The previous prime is 28128542543. The next prime is 28128542587. The reversal of 28128542571 is 17524582182.

28128542571 is a `hidden beast` number, since 2 + 8 + 1 + 28 + 54 + 2 + 571 = 666.

It is not a de Polignac number, because 28128542571 - 2⁵ = 28128542539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28128542591) 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, 868476 + ... + 900281.

It is an arithmetic number, because the mean of its divisors is an integer number (1415006400).

Almost surely, 2^28128542571 is an apocalyptic number.

28128542571 is a deficient number, since it is larger than the sum of its proper divisors (17151662229).

28128542571 is a wasteful number, since it uses less digits than its factorization.

28128542571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768816 (or 1768810 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The spelling of 28128542571 in words is "twenty-eight billion, one hundred twenty-eight million, five hundred forty-two thousand, five hundred seventy-one".