28533332857 has 2 divisors, whose sum is σ = 28533332858. Its totient is φ = 28533332856.

The previous prime is 28533332837. The next prime is 28533332881. The reversal of 28533332857 is 75823333582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17937512761 + 10595820096 = 133931^2 + 102936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28533332857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28533332857.

It is not a weakly prime, because it can be changed into another prime (28533332837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14266666428 + 14266666429.

It is an arithmetic number, because the mean of its divisors is an integer number (14266666429).

Almost surely, 2^28533332857 is an apocalyptic number.

It is an amenable number.

28533332857 is a deficient number, since it is larger than the sum of its proper divisors (1).

28533332857 is an equidigital number, since it uses as much as digits as its factorization.

28533332857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 49.

The spelling of 28533332857 in words is "twenty-eight billion, five hundred thirty-three million, three hundred thirty-two thousand, eight hundred fifty-seven".