128283720 has 32 divisors (see below), whose sum is σ = 384851520. Its totient is φ = 34208960.

The previous prime is 128283709. The next prime is 128283737. The reversal of 128283720 is 27382821.

It is a super-3 number, since 3×128283720³ (a number of 25 digits) contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 534396 + ... + 534635.

It is an arithmetic number, because the mean of its divisors is an integer number (12026610).

Almost surely, 2^128283720 is an apocalyptic number.

128283720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128283720 is an abundant number, since it is smaller than the sum of its proper divisors (256567800).

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

128283720 is a wasteful number, since it uses less digits than its factorization.

128283720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069045 (or 1069041 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 128283720 is about 11326.2403294297. The cubic root of 128283720 is about 504.3405043441.

The spelling of 128283720 in words is "one hundred twenty-eight million, two hundred eighty-three thousand, seven hundred twenty".