2805640 has 16 divisors (see below), whose sum is σ = 6312780. Its totient is φ = 1122240.

The previous prime is 2805637. The next prime is 2805643. The reversal of 2805640 is 465082.

2805640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2805637) and next prime (2805643).

It can be written as a sum of positive squares in 2 ways, for example, as 2802276 + 3364 = 1674^2 + 58^2 .

It is not an unprimeable number, because it can be changed into a prime (2805643) 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 3 ways as a sum of consecutive naturals, for example, 35031 + ... + 35110.

2^2805640 is an apocalyptic number.

2805640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2805640 is an abundant number, since it is smaller than the sum of its proper divisors (3507140).

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

2805640 is a wasteful number, since it uses less digits than its factorization.

2805640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70152 (or 70148 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2805640 is about 1675.0044776060. The cubic root of 2805640 is about 141.0405463260.

The spelling of 2805640 in words is "two million, eight hundred five thousand, six hundred forty".