2278605 has 16 divisors (see below), whose sum is σ = 4166784. Its totient is φ = 1041600.

The previous prime is 2278553. The next prime is 2278631. The reversal of 2278605 is 5068722.

It is not a de Polignac number, because 2278605 - 2⁷ = 2278477 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10746 + ... + 10955.

It is an arithmetic number, because the mean of its divisors is an integer number (260424).

2^2278605 is an apocalyptic number.

It is an amenable number.

2278605 is a deficient number, since it is larger than the sum of its proper divisors (1888179).

2278605 is a wasteful number, since it uses less digits than its factorization.

2278605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21716.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 2278605 is about 1509.5048857158. The cubic root of 2278605 is about 131.5900389106.

The spelling of 2278605 in words is "two million, two hundred seventy-eight thousand, six hundred five".