128849668 has 12 divisors (see below), whose sum is σ = 233262540. Its totient is φ = 62203232.

The previous prime is 128849653. The next prime is 128849683. The reversal of 128849668 is 866948821.

It is an interprime number because it is at equal distance from previous prime (128849653) and next prime (128849683).

It can be written as a sum of positive squares in 2 ways, for example, as 41576704 + 87272964 = 6448^2 + 9342^2 .

It is an unprimeable number.

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, 555271 + ... + 555502.

It is an arithmetic number, because the mean of its divisors is an integer number (19438545).

Almost surely, 2^128849668 is an apocalyptic number.

It is an amenable number.

128849668 is a deficient number, since it is larger than the sum of its proper divisors (104412872).

128849668 is a wasteful number, since it uses less digits than its factorization.

128849668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110806 (or 1110804 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 52.

The square root of 128849668 is about 11351.1967650993. The cubic root of 128849668 is about 505.0810809916.

The spelling of 128849668 in words is "one hundred twenty-eight million, eight hundred forty-nine thousand, six hundred sixty-eight".