28387597557 has 16 divisors (see below), whose sum is σ = 41328336960. Its totient is φ = 17189068800.

The previous prime is 28387597519. The next prime is 28387597559. The reversal of 28387597557 is 75579578382.

It is not a de Polignac number, because 28387597557 - 2⁷ = 28387597429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28387597559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351244 + ... + 424437.

It is an arithmetic number, because the mean of its divisors is an integer number (2583021060).

Almost surely, 2^28387597557 is an apocalyptic number.

It is an amenable number.

28387597557 is a deficient number, since it is larger than the sum of its proper divisors (12940739403).

28387597557 is a wasteful number, since it uses less digits than its factorization.

28387597557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776804.

The product of its digits is 148176000, while the sum is 66.

The spelling of 28387597557 in words is "twenty-eight billion, three hundred eighty-seven million, five hundred ninety-seven thousand, five hundred fifty-seven".