28240460557 has 4 divisors (see below), whose sum is σ = 28241131356. Its totient is φ = 28239789760.

The previous prime is 28240460543. The next prime is 28240460581. The reversal of 28240460557 is 75506404282.

It is a happy number.

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 12991668361 + 15248792196 = 113981^2 + 123486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28240460557 is a prime.

It is a super-2 number, since 2×28240460557² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28240460527) 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 3 ways as a sum of consecutive naturals, for example, 267694 + ... + 357967.

It is an arithmetic number, because the mean of its divisors is an integer number (7060282839).

Almost surely, 2^28240460557 is an apocalyptic number.

It is an amenable number.

28240460557 is a deficient number, since it is larger than the sum of its proper divisors (670799).

28240460557 is an equidigital number, since it uses as much as digits as its factorization.

28240460557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670798.

The product of its (nonzero) digits is 537600, while the sum is 43.

The spelling of 28240460557 in words is "twenty-eight billion, two hundred forty million, four hundred sixty thousand, five hundred fifty-seven".