2640064 has 56 divisors (see below), whose sum is σ = 6144768. Its totient is φ = 1102080.

The previous prime is 2640059. The next prime is 2640067. The reversal of 2640064 is 4600462.

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (2640067) 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, 31767 + ... + 31849.

It is an arithmetic number, because the mean of its divisors is an integer number (109728).

2^2640064 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 2640064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3072384).

2640064 is an abundant number, since it is smaller than the sum of its proper divisors (3504704).

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

2640064 is an equidigital number, since it uses as much as digits as its factorization.

2640064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 2640064 is about 1624.8273754464. The cubic root of 2640064 is about 138.2095814273.

The spelling of 2640064 in words is "two million, six hundred forty thousand, sixty-four".