128199734 has 8 divisors (see below), whose sum is σ = 207091920. Its totient is φ = 59169096.

The previous prime is 128199733. The next prime is 128199761. The reversal of 128199734 is 437991821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128199733) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2465354 + ... + 2465405.

It is an arithmetic number, because the mean of its divisors is an integer number (25886490).

Almost surely, 2^128199734 is an apocalyptic number.

128199734 is a deficient number, since it is larger than the sum of its proper divisors (78892186).

128199734 is a wasteful number, since it uses less digits than its factorization.

128199734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4930774.

The product of its digits is 108864, while the sum is 44.

The square root of 128199734 is about 11322.5321372916. The cubic root of 128199734 is about 504.2304181782.

The spelling of 128199734 in words is "one hundred twenty-eight million, one hundred ninety-nine thousand, seven hundred thirty-four".