2789778 has 8 divisors (see below), whose sum is σ = 5579568. Its totient is φ = 929924.

The previous prime is 2789777. The next prime is 2789791. The reversal of 2789778 is 8779872.

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

2789778 is an admirable number.

It is a super-2 number, since 2×2789778² = 15565722578568, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2789777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232476 + ... + 232487.

It is an arithmetic number, because the mean of its divisors is an integer number (697446).

2^2789778 is an apocalyptic number.

2789778 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.

2789778 is a wasteful number, since it uses less digits than its factorization.

2789778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464968.

The product of its digits is 395136, while the sum is 48.

The square root of 2789778 is about 1670.2628535653. The cubic root of 2789778 is about 140.7742476684.

The spelling of 2789778 in words is "two million, seven hundred eighty-nine thousand, seven hundred seventy-eight".