128297718 has 12 divisors (see below), whose sum is σ = 277978428. Its totient is φ = 42765900.

The previous prime is 128297693. The next prime is 128297737. The reversal of 128297718 is 817792821.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3563808 + ... + 3563843.

It is an arithmetic number, because the mean of its divisors is an integer number (23164869).

Almost surely, 2^128297718 is an apocalyptic number.

128297718 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

128297718 is an abundant number, since it is smaller than the sum of its proper divisors (149680710).

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

128297718 is a wasteful number, since it uses less digits than its factorization.

128297718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7127659 (or 7127656 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 128297718 is about 11326.8582581403. The cubic root of 128297718 is about 504.3588478034.

The spelling of 128297718 in words is "one hundred twenty-eight million, two hundred ninety-seven thousand, seven hundred eighteen".