128640599 has 2 divisors, whose sum is σ = 128640600. Its totient is φ = 128640598.

The previous prime is 128640571. The next prime is 128640637. The reversal of 128640599 is 995046821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128640599 is a prime.

It is a super-2 number, since 2×128640599² = 33096807422157602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128640539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64320299 + 64320300.

It is an arithmetic number, because the mean of its divisors is an integer number (64320300).

Almost surely, 2^128640599 is an apocalyptic number.

128640599 is a deficient number, since it is larger than the sum of its proper divisors (1).

128640599 is an equidigital number, since it uses as much as digits as its factorization.

128640599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 128640599 is about 11341.9839093520. The cubic root of 128640599 is about 504.8077548154.

The spelling of 128640599 in words is "one hundred twenty-eight million, six hundred forty thousand, five hundred ninety-nine".