2661688 has 8 divisors (see below), whose sum is σ = 4990680. Its totient is φ = 1330840.

The previous prime is 2661661. The next prime is 2661689. The reversal of 2661688 is 8861662.

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

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166348 + ... + 166363.

It is an arithmetic number, because the mean of its divisors is an integer number (623835).

2^2661688 is an apocalyptic number.

It is an amenable number.

2661688 is a deficient number, since it is larger than the sum of its proper divisors (2328992).

2661688 is a wasteful number, since it uses less digits than its factorization.

2661688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332717 (or 332713 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 2661688 is about 1631.4680505606. The cubic root of 2661688 is about 138.5859007401.

The spelling of 2661688 in words is "two million, six hundred sixty-one thousand, six hundred eighty-eight".