28774948157 has 2 divisors, whose sum is σ = 28774948158. Its totient is φ = 28774948156.

The previous prime is 28774948151. The next prime is 28774948159. The reversal of 28774948157 is 75184947782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27978918361 + 796029796 = 167269^2 + 28214^2 .

It is a cyclic number.

It is not a de Polignac number, because 28774948157 - 2²⁸ = 28506512701 is a prime.

Together with 28774948159, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28774948157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28774948151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14387474078 + 14387474079.

It is an arithmetic number, because the mean of its divisors is an integer number (14387474079).

Almost surely, 2^28774948157 is an apocalyptic number.

It is an amenable number.

28774948157 is a deficient number, since it is larger than the sum of its proper divisors (1).

28774948157 is an equidigital number, since it uses as much as digits as its factorization.

28774948157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31610880, while the sum is 62.

The spelling of 28774948157 in words is "twenty-eight billion, seven hundred seventy-four million, nine hundred forty-eight thousand, one hundred fifty-seven".