28057730551 has 4 divisors (see below), whose sum is σ = 28058080192.
Its totient is φ = 28057380912.
The previous prime is 28057730527. The next prime is 28057730557. The reversal of 28057730551 is 15503775082.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It is a cyclic number.
It is not a de Polignac number, because 28057730551 - 213 = 28057722359 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 28057730498 and 28057730507.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (28057730557) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12346 + ... + 237208.
It is an arithmetic number, because the mean of its divisors is an integer number (7014520048).
Almost surely, 228057730551 is an apocalyptic number.
28057730551 is a deficient number, since it is larger than the sum of its proper divisors (349641).
28057730551 is a wasteful number, since it uses less digits than its factorization.
28057730551 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 349640.
The product of its (nonzero) digits is 294000, while the sum is 43.
The spelling of 28057730551 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty thousand, five hundred fifty-one".