128142506 has 8 divisors (see below), whose sum is σ = 194080224. Its totient is φ = 63449100.

The previous prime is 128142493. The next prime is 128142523. The reversal of 128142506 is 605241821.

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

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, 310820 + ... + 311231.

It is an arithmetic number, because the mean of its divisors is an integer number (24260028).

Almost surely, 2^128142506 is an apocalyptic number.

128142506 is a deficient number, since it is larger than the sum of its proper divisors (65937718).

128142506 is a wasteful number, since it uses less digits than its factorization.

128142506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622156.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 128142506 is about 11320.0046819778. The cubic root of 128142506 is about 504.1553779986.

The spelling of 128142506 in words is "one hundred twenty-eight million, one hundred forty-two thousand, five hundred six".