28634430857 has 2 divisors, whose sum is σ = 28634430858. Its totient is φ = 28634430856.

The previous prime is 28634430767. The next prime is 28634430919. The reversal of 28634430857 is 75803443682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25823204416 + 2811226441 = 160696^2 + 53021^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28634430857 is a prime.

It is not a weakly prime, because it can be changed into another prime (28634432857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14317215428 + 14317215429.

It is an arithmetic number, because the mean of its divisors is an integer number (14317215429).

Almost surely, 2^28634430857 is an apocalyptic number.

It is an amenable number.

28634430857 is a deficient number, since it is larger than the sum of its proper divisors (1).

28634430857 is an equidigital number, since it uses as much as digits as its factorization.

28634430857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 50.

The spelling of 28634430857 in words is "twenty-eight billion, six hundred thirty-four million, four hundred thirty thousand, eight hundred fifty-seven".