2278665 has 16 divisors (see below), whose sum is σ = 4051200. Its totient is φ = 1215216.

The previous prime is 2278649. The next prime is 2278681. The reversal of 2278665 is 5668722.

It is an interprime number because it is at equal distance from previous prime (2278649) and next prime (2278681).

It is not a de Polignac number, because 2278665 - 2⁴ = 2278649 is a prime.

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, 8305 + ... + 8574.

It is an arithmetic number, because the mean of its divisors is an integer number (253200).

2^2278665 is an apocalyptic number.

It is an amenable number.

2278665 is a deficient number, since it is larger than the sum of its proper divisors (1772535).

2278665 is a wasteful number, since it uses less digits than its factorization.

2278665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16893 (or 16887 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 2278665 is about 1509.5247596512. The cubic root of 2278665 is about 131.5911939057.

It can be divided in two parts, 22 and 78665, that added together give a palindrome (78687).

The spelling of 2278665 in words is "two million, two hundred seventy-eight thousand, six hundred sixty-five".