128782986 has 8 divisors (see below), whose sum is σ = 257565984. Its totient is φ = 42927660.

The previous prime is 128782981. The next prime is 128782991. The reversal of 128782986 is 689287821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128782981) and next prime (128782991).

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

128782986 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (128782981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10731910 + ... + 10731921.

It is an arithmetic number, because the mean of its divisors is an integer number (32195748).

Almost surely, 2^128782986 is an apocalyptic number.

128782986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128782986 is a wasteful number, since it uses less digits than its factorization.

128782986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21463836.

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

The square root of 128782986 is about 11348.2591616512. The cubic root of 128782986 is about 504.9939364694.

The spelling of 128782986 in words is "one hundred twenty-eight million, seven hundred eighty-two thousand, nine hundred eighty-six".