2621664 has 36 divisors (see below), whose sum is σ = 7456176. Its totient is φ = 873792.

The previous prime is 2621617. The next prime is 2621669. The reversal of 2621664 is 4661262.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4264 + ... + 4839.

It is an arithmetic number, because the mean of its divisors is an integer number (207116).

2^2621664 is an apocalyptic number.

2621664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2621664 is an abundant number, since it is smaller than the sum of its proper divisors (4834512).

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

2621664 is a wasteful number, since it uses less digits than its factorization.

2621664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119 (or 9108 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 2621664 is about 1619.1553353524. The cubic root of 2621664 is about 137.8877474051.

The spelling of 2621664 in words is "two million, six hundred twenty-one thousand, six hundred sixty-four".