28715808237 has 4 divisors (see below), whose sum is σ = 38287744320. Its totient is φ = 19143872156.

The previous prime is 28715808229. The next prime is 28715808257. The reversal of 28715808237 is 73280851782.

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 28715808237 - 2³ = 28715808229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28715808237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28715808227) 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, 4785968037 + ... + 4785968042.

It is an arithmetic number, because the mean of its divisors is an integer number (9571936080).

Almost surely, 2^28715808237 is an apocalyptic number.

It is an amenable number.

28715808237 is a deficient number, since it is larger than the sum of its proper divisors (9571936083).

28715808237 is an equidigital number, since it uses as much as digits as its factorization.

28715808237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9571936082.

The product of its (nonzero) digits is 1505280, while the sum is 51.

The spelling of 28715808237 in words is "twenty-eight billion, seven hundred fifteen million, eight hundred eight thousand, two hundred thirty-seven".