2660664 has 32 divisors (see below), whose sum is σ = 6768000. Its totient is φ = 871392.

The previous prime is 2660659. The next prime is 2660719. The reversal of 2660664 is 4660662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477 + ... + 2355.

It is an arithmetic number, because the mean of its divisors is an integer number (211500).

2^2660664 is an apocalyptic number.

2660664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2660664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3384000).

2660664 is an abundant number, since it is smaller than the sum of its proper divisors (4107336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2660664 is a wasteful number, since it uses less digits than its factorization.

2660664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947 (or 1943 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 2660664 is about 1631.1541925888. The cubic root of 2660664 is about 138.5681262846.

The spelling of 2660664 in words is "two million, six hundred sixty thousand, six hundred sixty-four".