28811830157 has 4 divisors (see below), whose sum is σ = 31431087456. Its totient is φ = 26192572860.

The previous prime is 28811830133. The next prime is 28811830171. The reversal of 28811830157 is 75103811882.

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.

It is a cyclic number.

It is not a de Polignac number, because 28811830157 - 2¹⁸ = 28811568013 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 (28811850157) 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, 1309628633 + ... + 1309628654.

It is an arithmetic number, because the mean of its divisors is an integer number (7857771864).

Almost surely, 2^28811830157 is an apocalyptic number.

It is an amenable number.

28811830157 is a deficient number, since it is larger than the sum of its proper divisors (2619257299).

28811830157 is a wasteful number, since it uses less digits than its factorization.

28811830157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619257298.

The product of its (nonzero) digits is 107520, while the sum is 44.

The spelling of 28811830157 in words is "twenty-eight billion, eight hundred eleven million, eight hundred thirty thousand, one hundred fifty-seven".