2128578 has 8 divisors (see below), whose sum is σ = 4257168. Its totient is φ = 709524.

The previous prime is 2128561. The next prime is 2128591. The reversal of 2128578 is 8758212.

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

2128578 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 177376 + ... + 177387.

It is an arithmetic number, because the mean of its divisors is an integer number (532146).

2^2128578 is an apocalyptic number.

2128578 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2128578 is a wasteful number, since it uses less digits than its factorization.

2128578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354768.

The product of its digits is 8960, while the sum is 33.

The square root of 2128578 is about 1458.9647014236. The cubic root of 2128578 is about 128.6361962920.

The spelling of 2128578 in words is "two million, one hundred twenty-eight thousand, five hundred seventy-eight".