128642555 has 8 divisors (see below), whose sum is σ = 155148000. Its totient is φ = 102396096.

The previous prime is 128642537. The next prime is 128642581. The reversal of 128642555 is 555246821.

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

It is a cyclic number.

It is not a de Polignac number, because 128642555 - 2¹⁶ = 128577019 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63650 + ... + 65639.

It is an arithmetic number, because the mean of its divisors is an integer number (19393500).

Almost surely, 2^128642555 is an apocalyptic number.

128642555 is a deficient number, since it is larger than the sum of its proper divisors (26505445).

128642555 is a wasteful number, since it uses less digits than its factorization.

128642555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129493.

The product of its digits is 96000, while the sum is 38.

The square root of 128642555 is about 11342.0701373250. The cubic root of 128642555 is about 504.8103133622.

The spelling of 128642555 in words is "one hundred twenty-eight million, six hundred forty-two thousand, five hundred fifty-five".