128729018 has 8 divisors (see below), whose sum is σ = 210647520. Its totient is φ = 58513180.

The previous prime is 128729011. The next prime is 128729021. The reversal of 128729018 is 810927821.

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

It is not an unprimeable number, because it can be changed into a prime (128729011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2925638 + ... + 2925681.

It is an arithmetic number, because the mean of its divisors is an integer number (26330940).

Almost surely, 2^128729018 is an apocalyptic number.

128729018 is a deficient number, since it is larger than the sum of its proper divisors (81918502).

128729018 is a wasteful number, since it uses less digits than its factorization.

128729018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5851332.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 128729018 is about 11345.8811028496. The cubic root of 128729018 is about 504.9233854298.

The spelling of 128729018 in words is "one hundred twenty-eight million, seven hundred twenty-nine thousand, eighteen".