128868587 has 2 divisors, whose sum is σ = 128868588. Its totient is φ = 128868586.

The previous prime is 128868577. The next prime is 128868589. The reversal of 128868587 is 785868821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128868587 - 2¹⁴ = 128852203 is a prime.

It is a super-2 number, since 2×128868587² = 33214225430753138, which contains 22 as substring.

Together with 128868589, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128868589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64434293 + 64434294.

It is an arithmetic number, because the mean of its divisors is an integer number (64434294).

Almost surely, 2^128868587 is an apocalyptic number.

128868587 is a deficient number, since it is larger than the sum of its proper divisors (1).

128868587 is an equidigital number, since it uses as much as digits as its factorization.

128868587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1720320, while the sum is 53.

The square root of 128868587 is about 11352.0300827649. The cubic root of 128868587 is about 505.1058001378.

The spelling of 128868587 in words is "one hundred twenty-eight million, eight hundred sixty-eight thousand, five hundred eighty-seven".