2780878 has 8 divisors (see below), whose sum is σ = 4390920. Its totient is φ = 1317240.

The previous prime is 2780873. The next prime is 2780887. The reversal of 2780878 is 8780872.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2780878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36553 + ... + 36628.

It is an arithmetic number, because the mean of its divisors is an integer number (548865).

2^2780878 is an apocalyptic number.

2780878 is a deficient number, since it is larger than the sum of its proper divisors (1610042).

2780878 is a wasteful number, since it uses less digits than its factorization.

2780878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73202.

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 2780878 is about 1667.5964739708. The cubic root of 2780878 is about 140.6243880138.

The spelling of 2780878 in words is "two million, seven hundred eighty thousand, eight hundred seventy-eight".