2779666 has 4 divisors (see below), whose sum is σ = 4169502. Its totient is φ = 1389832.

The previous prime is 2779663. The next prime is 2779669. The reversal of 2779666 is 6669772.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2779663) and next prime (2779669).

It can be written as a sum of positive squares in only one way, i.e., 2653641 + 126025 = 1629^2 + 355^2 .

It is not an unprimeable number, because it can be changed into a prime (2779663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694915 + ... + 694918.

2^2779666 is an apocalyptic number.

2779666 is a deficient number, since it is larger than the sum of its proper divisors (1389836).

2779666 is a wasteful number, since it uses less digits than its factorization.

2779666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389835.

The product of its digits is 190512, while the sum is 43.

The square root of 2779666 is about 1667.2330371007. The cubic root of 2779666 is about 140.6039554352.

The spelling of 2779666 in words is "two million, seven hundred seventy-nine thousand, six hundred sixty-six".