128196840 has 32 divisors (see below), whose sum is σ = 384590880. Its totient is φ = 34185792.

The previous prime is 128196799. The next prime is 128196851. The reversal of 128196840 is 48691821.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534034 + ... + 534273.

It is an arithmetic number, because the mean of its divisors is an integer number (12018465).

Almost surely, 2^128196840 is an apocalyptic number.

128196840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128196840 is an abundant number, since it is smaller than the sum of its proper divisors (256394040).

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

128196840 is a wasteful number, since it uses less digits than its factorization.

128196840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068321 (or 1068317 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 128196840 is about 11322.4043383020. The cubic root of 128196840 is about 504.2266239586.

The spelling of 128196840 in words is "one hundred twenty-eight million, one hundred ninety-six thousand, eight hundred forty".