128987567 has 2 divisors, whose sum is σ = 128987568. Its totient is φ = 128987566.

The previous prime is 128987477. The next prime is 128987591. The reversal of 128987567 is 765789821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128987567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128987267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64493783 + 64493784.

It is an arithmetic number, because the mean of its divisors is an integer number (64493784).

Almost surely, 2^128987567 is an apocalyptic number.

128987567 is a deficient number, since it is larger than the sum of its proper divisors (1).

128987567 is an equidigital number, since it uses as much as digits as its factorization.

128987567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 53.

The square root of 128987567 is about 11357.2693461060. The cubic root of 128987567 is about 505.2612013457.

The spelling of 128987567 in words is "one hundred twenty-eight million, nine hundred eighty-seven thousand, five hundred sixty-seven".