2491664 has 20 divisors (see below), whose sum is σ = 5517504. Its totient is φ = 1067808.

The previous prime is 2491661. The next prime is 2491669. The reversal of 2491664 is 4661942.

It is a happy number.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a d-powerful number, because it can be written as 2²¹ + 4⁸ + 9⁵ + 1 + 6 + 6⁵ + 4⁹ .

It is a self number, because there is not a number n which added to its sum of digits gives 2491664.

It is not an unprimeable number, because it can be changed into a prime (2491661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11012 + ... + 11235.

2^2491664 is an apocalyptic number.

It is an amenable number.

2491664 is an abundant number, since it is smaller than the sum of its proper divisors (3025840).

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

2491664 is a wasteful number, since it uses less digits than its factorization.

2491664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22262 (or 22256 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 2491664 is about 1578.5005543236. The cubic root of 2491664 is about 135.5698636196.

The spelling of 2491664 in words is "two million, four hundred ninety-one thousand, six hundred sixty-four".