28355072557 has 16 divisors (see below), whose sum is σ = 33024868992. Its totient is φ = 23840256960.

The previous prime is 28355072533. The next prime is 28355072563. The reversal of 28355072557 is 75527055382.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28355072557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28355072557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28355072587) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2780007 + ... + 2790187.

It is an arithmetic number, because the mean of its divisors is an integer number (2064054312).

Almost surely, 2^28355072557 is an apocalyptic number.

It is an amenable number.

28355072557 is a deficient number, since it is larger than the sum of its proper divisors (4669796435).

28355072557 is a wasteful number, since it uses less digits than its factorization.

28355072557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17748.

The product of its (nonzero) digits is 2940000, while the sum is 49.

The spelling of 28355072557 in words is "twenty-eight billion, three hundred fifty-five million, seventy-two thousand, five hundred fifty-seven".