128786840 has 64 divisors (see below), whose sum is σ = 356650560. Its totient is φ = 40757760.

The previous prime is 128786839. The next prime is 128786923. The reversal of 128786840 is 48687821.

It is a junction number, because it is equal to n+sod(n) for n = 128786791 and 128786800.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 14051 + ... + 21330.

It is an arithmetic number, because the mean of its divisors is an integer number (5572665).

Almost surely, 2^128786840 is an apocalyptic number.

128786840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128786840 is an abundant number, since it is smaller than the sum of its proper divisors (227863720).

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

128786840 is a wasteful number, since it uses less digits than its factorization.

128786840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35412 (or 35408 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 44.

The square root of 128786840 is about 11348.4289661609. The cubic root of 128786840 is about 504.9989739547.

The spelling of 128786840 in words is "one hundred twenty-eight million, seven hundred eighty-six thousand, eight hundred forty".