128031992 has 32 divisors (see below), whose sum is σ = 262321200. Its totient is φ = 58099200.

The previous prime is 128031989. The next prime is 128032019. The reversal of 128031992 is 299130821.

It is a Smith number, since the sum of its digits (35) 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 7 ways as a sum of consecutive naturals, for example, 93392 + ... + 94752.

Almost surely, 2^128031992 is an apocalyptic number.

It is an amenable number.

128031992 is an abundant number, since it is smaller than the sum of its proper divisors (134289208).

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

128031992 is a wasteful number, since it uses less digits than its factorization.

128031992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2447 (or 2443 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 128031992 is about 11315.1222706606. The cubic root of 128031992 is about 504.0104033294.

The spelling of 128031992 in words is "one hundred twenty-eight million, thirty-one thousand, nine hundred ninety-two".