128821982 has 16 divisors (see below), whose sum is σ = 197899200. Its totient is φ = 62874240.

The previous prime is 128821967. The next prime is 128821991. The reversal of 128821982 is 289128821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9482 + ... + 18642.

It is an arithmetic number, because the mean of its divisors is an integer number (12368700).

Almost surely, 2^128821982 is an apocalyptic number.

128821982 is a deficient number, since it is larger than the sum of its proper divisors (69077218).

128821982 is an equidigital number, since it uses as much as digits as its factorization.

128821982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9331.

The product of its digits is 36864, while the sum is 41.

The square root of 128821982 is about 11349.9771805938. The cubic root of 128821982 is about 505.0449027158.

The spelling of 128821982 in words is "one hundred twenty-eight million, eight hundred twenty-one thousand, nine hundred eighty-two".