2645864 has 48 divisors (see below), whose sum is σ = 5709600. Its totient is φ = 1145664.

The previous prime is 2645861. The next prime is 2645879. The reversal of 2645864 is 4685462.

2645864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2645861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25637 + ... + 25739.

It is an arithmetic number, because the mean of its divisors is an integer number (118950).

2^2645864 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 2645864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2854800).

2645864 is an abundant number, since it is smaller than the sum of its proper divisors (3063736).

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

2645864 is a wasteful number, since it uses less digits than its factorization.

2645864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 137 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

The square root of 2645864 is about 1626.6112012402. The cubic root of 2645864 is about 138.3107190336.

It can be divided in two parts, 26 and 45864, that multiplied together give a square (1192464 = 1092²).

The spelling of 2645864 in words is "two million, six hundred forty-five thousand, eight hundred sixty-four".