28243552557 has 16 divisors (see below), whose sum is σ = 41088018240. Its totient is φ = 17114601600.

The previous prime is 28243552541. The next prime is 28243552619. The reversal of 28243552557 is 75525534282.

It is not a de Polignac number, because 28243552557 - 2⁴ = 28243552541 is a prime.

It is a super-2 number, since 2×28243552557² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28243552957) 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, 155569 + ... + 284057.

It is an arithmetic number, because the mean of its divisors is an integer number (2568001140).

Almost surely, 2^28243552557 is an apocalyptic number.

It is an amenable number.

28243552557 is a deficient number, since it is larger than the sum of its proper divisors (12844465683).

28243552557 is a wasteful number, since it uses less digits than its factorization.

28243552557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135164.

The product of its digits is 3360000, while the sum is 48.

The spelling of 28243552557 in words is "twenty-eight billion, two hundred forty-three million, five hundred fifty-two thousand, five hundred fifty-seven".