2601664 has 56 divisors (see below), whose sum is σ = 5760720. Its totient is φ = 1158144.

The previous prime is 2601661. The next prime is 2601671. The reversal of 2601664 is 4661062.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2601661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44067 + ... + 44125.

It is an arithmetic number, because the mean of its divisors is an integer number (102870).

2^2601664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2601664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2880360).

2601664 is an abundant number, since it is smaller than the sum of its proper divisors (3159056).

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

2601664 is a wasteful number, since it uses less digits than its factorization.

2601664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 2601664 is about 1612.9674516245. The cubic root of 2601664 is about 137.5362152540.

The spelling of 2601664 in words is "two million, six hundred one thousand, six hundred sixty-four".