2664240 has 80 divisors (see below), whose sum is σ = 8758368. Its totient is φ = 667648.

The previous prime is 2664229. The next prime is 2664241. The reversal of 2664240 is 424662.

2664240 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2664240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2664241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3754 + ... + 4406.

2^2664240 is an apocalyptic number.

2664240 is a gapful number since it is divisible by the number (20) 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 2664240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4379184).

2664240 is an abundant number, since it is smaller than the sum of its proper divisors (6094128).

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

2664240 is a wasteful number, since it uses less digits than its factorization.

2664240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 680 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 2664240 is about 1632.2499808546. The cubic root of 2664240 is about 138.6301781870.

The spelling of 2664240 in words is "two million, six hundred sixty-four thousand, two hundred forty".