2778258 has 32 divisors (see below), whose sum is σ = 6572160. Its totient is φ = 766080.

The previous prime is 2778257. The next prime is 2778263. The reversal of 2778258 is 8528772.

It is a super-3 number, since 3×2778258³ = 64333766053732648536, which contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2778257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78 + ... + 2358.

It is an arithmetic number, because the mean of its divisors is an integer number (205380).

2^2778258 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2778258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3286080).

2778258 is an abundant number, since it is smaller than the sum of its proper divisors (3793902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2778258 is a wasteful number, since it uses less digits than its factorization.

2778258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322.

The product of its digits is 62720, while the sum is 39.

The square root of 2778258 is about 1666.8107271073. The cubic root of 2778258 is about 140.5802111190.

The spelling of 2778258 in words is "two million, seven hundred seventy-eight thousand, two hundred fifty-eight".