28640383867 has 2 divisors, whose sum is σ = 28640383868. Its totient is φ = 28640383866.

The previous prime is 28640383861. The next prime is 28640383879. The reversal of 28640383867 is 76838304682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28640383867 - 2³ = 28640383859 is a prime.

It is a super-2 number, since 2×28640383867² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28640383861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14320191933 + 14320191934.

It is an arithmetic number, because the mean of its divisors is an integer number (14320191934).

Almost surely, 2^28640383867 is an apocalyptic number.

28640383867 is a deficient number, since it is larger than the sum of its proper divisors (1).

28640383867 is an equidigital number, since it uses as much as digits as its factorization.

28640383867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9289728, while the sum is 55.

The spelling of 28640383867 in words is "twenty-eight billion, six hundred forty million, three hundred eighty-three thousand, eight hundred sixty-seven".