128826987 has 8 divisors (see below), whose sum is σ = 171875904. Its totient is φ = 85831368.

The previous prime is 128826983. The next prime is 128827001. The reversal of 128826987 is 789628821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128826987 - 2² = 128826983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128826983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7293 + ... + 17630.

It is an arithmetic number, because the mean of its divisors is an integer number (21484488).

Almost surely, 2^128826987 is an apocalyptic number.

128826987 is a deficient number, since it is larger than the sum of its proper divisors (43048917).

128826987 is a wasteful number, since it uses less digits than its factorization.

128826987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26649.

The product of its digits is 774144, while the sum is 51.

The square root of 128826987 is about 11350.1976634771. The cubic root of 128826987 is about 505.0514433102.

The spelling of 128826987 in words is "one hundred twenty-eight million, eight hundred twenty-six thousand, nine hundred eighty-seven".