28157662757 has 4 divisors (see below), whose sum is σ = 32180186016. Its totient is φ = 24135139500.

The previous prime is 28157662703. The next prime is 28157662763. The reversal of 28157662757 is 75726675182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75726675182 = 2 ⋅37863337591.

It is a cyclic number.

It is not a de Polignac number, because 28157662757 - 2³⁴ = 10977793573 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 (28157662787) 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, 2011261619 + ... + 2011261632.

It is an arithmetic number, because the mean of its divisors is an integer number (8045046504).

Almost surely, 2^28157662757 is an apocalyptic number.

It is an amenable number.

28157662757 is a deficient number, since it is larger than the sum of its proper divisors (4022523259).

28157662757 is an equidigital number, since it uses as much as digits as its factorization.

28157662757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022523258.

The product of its digits is 9878400, while the sum is 56.

The spelling of 28157662757 in words is "twenty-eight billion, one hundred fifty-seven million, six hundred sixty-two thousand, seven hundred fifty-seven".