2640785 has 16 divisors (see below), whose sum is σ = 3649536. Its totient is φ = 1796928.

The previous prime is 2640779. The next prime is 2640821. The reversal of 2640785 is 5870462.

It is not a de Polignac number, because 2640785 - 2⁶ = 2640721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6704 + ... + 7086.

It is an arithmetic number, because the mean of its divisors is an integer number (228096).

2^2640785 is an apocalyptic number.

It is an amenable number.

2640785 is a deficient number, since it is larger than the sum of its proper divisors (1008751).

2640785 is a wasteful number, since it uses less digits than its factorization.

2640785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 2640785 is about 1625.0492300235. The cubic root of 2640785 is about 138.2221619352. Note that the first 3 decimals are identical.

The spelling of 2640785 in words is "two million, six hundred forty thousand, seven hundred eighty-five".