2778279 has 8 divisors (see below), whose sum is σ = 4233600. Its totient is φ = 1587576.

The previous prime is 2778277. The next prime is 2778299. The reversal of 2778279 is 9728772.

2778279 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2778279 - 2¹ = 2778277 is a prime.

2778279 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2778279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778277) 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 in 7 ways as a sum of consecutive naturals, for example, 66129 + ... + 66170.

It is an arithmetic number, because the mean of its divisors is an integer number (529200).

2^2778279 is an apocalyptic number.

2778279 is a deficient number, since it is larger than the sum of its proper divisors (1455321).

2778279 is a wasteful number, since it uses less digits than its factorization.

2778279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132309.

The product of its digits is 98784, while the sum is 42.

The square root of 2778279 is about 1666.8170265509. The cubic root of 2778279 is about 140.5805653190.

The spelling of 2778279 in words is "two million, seven hundred seventy-eight thousand, two hundred seventy-nine".