28025756537057 has 4 divisors (see below), whose sum is σ = 28028038591236. Its totient is φ = 28023474482880.

The previous prime is 28025756537027. The next prime is 28025756537161. The reversal of 28025756537057 is 75073565752082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9285939776656 + 18739816760401 = 3047284^2 + 4328951^2 .

It is a cyclic number.

It is not a de Polignac number, because 28025756537057 - 2⁶ = 28025756536993 is a prime.

It is a super-3 number, since 3×28025756537057³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28025756537027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1141008668 + ... + 1141033229.

It is an arithmetic number, because the mean of its divisors is an integer number (7007009647809).

Almost surely, 2^{28025756537057} is an apocalyptic number.

It is an amenable number.

28025756537057 is a deficient number, since it is larger than the sum of its proper divisors (2282054179).

28025756537057 is a wasteful number, since it uses less digits than its factorization.

28025756537057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282054178.

The product of its (nonzero) digits is 123480000, while the sum is 62.

The spelling of 28025756537057 in words is "twenty-eight trillion, twenty-five billion, seven hundred fifty-six million, five hundred thirty-seven thousand, fifty-seven".