128630879 has 8 divisors (see below), whose sum is σ = 138786480. Its totient is φ = 118512576.

The previous prime is 128630849. The next prime is 128630897. The reversal of 128630879 is 978036821.

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

It is not a de Polignac number, because 128630879 - 2²⁰ = 127582303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128630849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1934 + ... + 16155.

It is an arithmetic number, because the mean of its divisors is an integer number (17348310).

Almost surely, 2^128630879 is an apocalyptic number.

128630879 is a deficient number, since it is larger than the sum of its proper divisors (10155601).

128630879 is a wasteful number, since it uses less digits than its factorization.

128630879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18649.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 128630879 is about 11341.5554047935. Note that the first 3 decimals coincide. The cubic root of 128630879 is about 504.7950401800.

The spelling of 128630879 in words is "one hundred twenty-eight million, six hundred thirty thousand, eight hundred seventy-nine".