28319358857 has 2 divisors, whose sum is σ = 28319358858. Its totient is φ = 28319358856.

The previous prime is 28319358817. The next prime is 28319358871. The reversal of 28319358857 is 75885391382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24200158096 + 4119200761 = 155564^2 + 64181^2 .

It is a cyclic number.

It is not a de Polignac number, because 28319358857 - 2¹⁸ = 28319096713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28319358796 and 28319358805.

It is not a weakly prime, because it can be changed into another prime (28319358817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14159679428 + 14159679429.

It is an arithmetic number, because the mean of its divisors is an integer number (14159679429).

Almost surely, 2^28319358857 is an apocalyptic number.

It is an amenable number.

28319358857 is a deficient number, since it is larger than the sum of its proper divisors (1).

28319358857 is an equidigital number, since it uses as much as digits as its factorization.

28319358857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 59.

The spelling of 28319358857 in words is "twenty-eight billion, three hundred nineteen million, three hundred fifty-eight thousand, eight hundred fifty-seven".