28640051969 has 2 divisors, whose sum is σ = 28640051970. Its totient is φ = 28640051968.

The previous prime is 28640051897. The next prime is 28640051977. The reversal of 28640051969 is 96915004682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15058480369 + 13581571600 = 122713^2 + 116540^2 .

It is a cyclic number.

It is not a de Polignac number, because 28640051969 - 2²⁴ = 28623274753 is a prime.

It is a super-2 number, since 2×28640051969² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28640051269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14320025984 + 14320025985.

It is an arithmetic number, because the mean of its divisors is an integer number (14320025985).

Almost surely, 2^28640051969 is an apocalyptic number.

It is an amenable number.

28640051969 is a deficient number, since it is larger than the sum of its proper divisors (1).

28640051969 is an equidigital number, since it uses as much as digits as its factorization.

28640051969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 28640051969 in words is "twenty-eight billion, six hundred forty million, fifty-one thousand, nine hundred sixty-nine".