2278278 has 24 divisors (see below), whose sum is σ = 5043168. Its totient is φ = 742992.

The previous prime is 2278277. The next prime is 2278291. The reversal of 2278278 is 8728722.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a d-powerful number, because it can be written as 2⁷ + 2¹⁷ + 7³ + 8 + 2²¹ + 7⁵ + 8⁵ .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 501 + ... + 2192.

It is an arithmetic number, because the mean of its divisors is an integer number (210132).

2^2278278 is an apocalyptic number.

2278278 is an abundant number, since it is smaller than the sum of its proper divisors (2764890).

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

2278278 is a wasteful number, since it uses less digits than its factorization.

2278278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748 (or 2745 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 2278278 is about 1509.3965681689. The cubic root of 2278278 is about 131.5837438308.

It can be divided in two parts, 2278 and 278, that added together give a triangular number (2556 = T₇₁).

The spelling of 2278278 in words is "two million, two hundred seventy-eight thousand, two hundred seventy-eight".