2128678 has 4 divisors (see below), whose sum is σ = 3193020. Its totient is φ = 1064338.

The previous prime is 2128669. The next prime is 2128697. The reversal of 2128678 is 8768212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532168 + ... + 532171.

It is an arithmetic number, because the mean of its divisors is an integer number (798255).

2^2128678 is an apocalyptic number.

2128678 is a deficient number, since it is larger than the sum of its proper divisors (1064342).

2128678 is a wasteful number, since it uses less digits than its factorization.

2128678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064341.

The product of its digits is 10752, while the sum is 34.

The square root of 2128678 is about 1458.9989718982. The cubic root of 2128678 is about 128.6382106913.

The spelling of 2128678 in words is "two million, one hundred twenty-eight thousand, six hundred seventy-eight".