2686664 has 8 divisors (see below), whose sum is σ = 5037510. Its totient is φ = 1343328.

The previous prime is 2686631. The next prime is 2686667. The reversal of 2686664 is 4666862.

It can be written as a sum of positive squares in only one way, i.e., 1768900 + 917764 = 1330^2 + 958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (2686667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167909 + ... + 167924.

2^2686664 is an apocalyptic number.

It is an amenable number.

2686664 is a deficient number, since it is larger than the sum of its proper divisors (2350846).

2686664 is a wasteful number, since it uses less digits than its factorization.

2686664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335839 (or 335835 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 2686664 is about 1639.1046336339. The cubic root of 2686664 is about 139.0180264046.

The spelling of 2686664 in words is "two million, six hundred eighty-six thousand, six hundred sixty-four".