2278505 has 4 divisors (see below), whose sum is σ = 2734212. Its totient is φ = 1822800.

The previous prime is 2278487. The next prime is 2278517. The reversal of 2278505 is 5058722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5058722 = 2 ⋅2529361.

It can be written as a sum of positive squares in 2 ways, for example, as 506944 + 1771561 = 712^2 + 1331^2 .

It is not a de Polignac number, because 2278505 - 2⁸ = 2278249 is a prime.

It is a d-powerful number, because it can be written as 2⁷ + 2²⁰ + 7⁷ + 8 + 5⁶ + 0 + 5⁸ .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227846 + ... + 227855.

It is an arithmetic number, because the mean of its divisors is an integer number (683553).

2^2278505 is an apocalyptic number.

It is an amenable number.

2278505 is a deficient number, since it is larger than the sum of its proper divisors (455707).

2278505 is an equidigital number, since it uses as much as digits as its factorization.

2278505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455706.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 2278505 is about 1509.4717619088. The cubic root of 2278505 is about 131.5881138737.

The spelling of 2278505 in words is "two million, two hundred seventy-eight thousand, five hundred five".