128785392 has 30 divisors (see below), whose sum is σ = 360420632. Its totient is φ = 42928416.

The previous prime is 128785381. The next prime is 128785417. The reversal of 128785392 is 293587821.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 447028 + ... + 447315.

Almost surely, 2^128785392 is an apocalyptic number.

128785392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128785392 is an abundant number, since it is smaller than the sum of its proper divisors (231635240).

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

128785392 is a wasteful number, since it uses less digits than its factorization.

128785392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894357 (or 894348 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 128785392 is about 11348.3651686047. The cubic root of 128785392 is about 504.9970813150.

The spelling of 128785392 in words is "one hundred twenty-eight million, seven hundred eighty-five thousand, three hundred ninety-two".