28557707357 has 4 divisors (see below), whose sum is σ = 29025866556. Its totient is φ = 28089548160.

The previous prime is 28557707323. The next prime is 28557707359. The reversal of 28557707357 is 75370775582.

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 1165471321 + 27392236036 = 34139^2 + 165506^2 .

It is a cyclic number.

It is not a de Polignac number, because 28557707357 - 2⁶ = 28557707293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28557707359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234079508 + ... + 234079629.

It is an arithmetic number, because the mean of its divisors is an integer number (7256466639).

Almost surely, 2^28557707357 is an apocalyptic number.

It is an amenable number.

28557707357 is a deficient number, since it is larger than the sum of its proper divisors (468159199).

28557707357 is an equidigital number, since it uses as much as digits as its factorization.

28557707357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468159198.

The product of its (nonzero) digits is 14406000, while the sum is 56.

The spelling of 28557707357 in words is "twenty-eight billion, five hundred fifty-seven million, seven hundred seven thousand, three hundred fifty-seven".