2643878 has 4 divisors (see below), whose sum is σ = 3965820. Its totient is φ = 1321938.

The previous prime is 2643871. The next prime is 2643889. The reversal of 2643878 is 8783462.

2643878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660968 + ... + 660971.

It is an arithmetic number, because the mean of its divisors is an integer number (991455).

2^2643878 is an apocalyptic number.

2643878 is a deficient number, since it is larger than the sum of its proper divisors (1321942).

2643878 is a wasteful number, since it uses less digits than its factorization.

2643878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321941.

The product of its digits is 64512, while the sum is 38.

The square root of 2643878 is about 1626.0006150060. Note that the first 3 decimals coincide. The cubic root of 2643878 is about 138.2761047773.

The spelling of 2643878 in words is "two million, six hundred forty-three thousand, eight hundred seventy-eight".