128862887 has 4 divisors (see below), whose sum is σ = 128888760. Its totient is φ = 128837016.

The previous prime is 128862857. The next prime is 128862901. The reversal of 128862887 is 788268821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128862887 - 2¹⁶ = 128797351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128862817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2837 + ... + 16302.

It is an arithmetic number, because the mean of its divisors is an integer number (32222190).

Almost surely, 2^128862887 is an apocalyptic number.

128862887 is a deficient number, since it is larger than the sum of its proper divisors (25873).

128862887 is an equidigital number, since it uses as much as digits as its factorization.

128862887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25872.

The product of its digits is 688128, while the sum is 50.

The square root of 128862887 is about 11351.7790235716. The cubic root of 128862887 is about 505.0983528987.

The spelling of 128862887 in words is "one hundred twenty-eight million, eight hundred sixty-two thousand, eight hundred eighty-seven".