128251668 has 48 divisors (see below), whose sum is σ = 305363520. Its totient is φ = 41885184.

The previous prime is 128251661. The next prime is 128251693. The reversal of 128251668 is 866152821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128251661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215980 + ... + 216572.

It is an arithmetic number, because the mean of its divisors is an integer number (6361740).

Almost surely, 2^128251668 is an apocalyptic number.

It is an amenable number.

128251668 is an abundant number, since it is smaller than the sum of its proper divisors (177111852).

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

128251668 is a wasteful number, since it uses less digits than its factorization.

128251668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936 (or 934 counting only the distinct ones).

The product of its digits is 46080, while the sum is 39.

The square root of 128251668 is about 11324.8252966657. The cubic root of 128251668 is about 504.2984972774.

The spelling of 128251668 in words is "one hundred twenty-eight million, two hundred fifty-one thousand, six hundred sixty-eight".