128751992 has 8 divisors (see below), whose sum is σ = 241410000. Its totient is φ = 64375992.

The previous prime is 128751979. The next prime is 128752003. The reversal of 128751992 is 299157821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8046992 + ... + 8047007.

It is an arithmetic number, because the mean of its divisors is an integer number (30176250).

Almost surely, 2^128751992 is an apocalyptic number.

It is an amenable number.

128751992 is a deficient number, since it is larger than the sum of its proper divisors (112658008).

128751992 is a wasteful number, since it uses less digits than its factorization.

128751992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16094005 (or 16094001 counting only the distinct ones).

The product of its digits is 90720, while the sum is 44.

The square root of 128751992 is about 11346.8934955784. The cubic root of 128751992 is about 504.9534211851.

The spelling of 128751992 in words is "one hundred twenty-eight million, seven hundred fifty-one thousand, nine hundred ninety-two".