128781734 has 8 divisors (see below), whose sum is σ = 203339640. Its totient is φ = 61001856.

The previous prime is 128781713. The next prime is 128781769. The reversal of 128781734 is 437187821.

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

It is a junction number, because it is equal to n+sod(n) for n = 128781691 and 128781700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1694459 + ... + 1694534.

It is an arithmetic number, because the mean of its divisors is an integer number (25417455).

Almost surely, 2^128781734 is an apocalyptic number.

128781734 is a deficient number, since it is larger than the sum of its proper divisors (74557906).

128781734 is a wasteful number, since it uses less digits than its factorization.

128781734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3389014.

The product of its digits is 75264, while the sum is 41.

The square root of 128781734 is about 11348.2039988714. The cubic root of 128781734 is about 504.9922999839.

The spelling of 128781734 in words is "one hundred twenty-eight million, seven hundred eighty-one thousand, seven hundred thirty-four".