2640784 has 10 divisors (see below), whose sum is σ = 5116550. Its totient is φ = 1320384.

The previous prime is 2640779. The next prime is 2640821. The reversal of 2640784 is 4870462.

It can be written as a sum of positive squares in only one way, i.e., 2624400 + 16384 = 1620^2 + 128^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82509 + ... + 82540.

It is an arithmetic number, because the mean of its divisors is an integer number (511655).

2^2640784 is an apocalyptic number.

It is an amenable number.

2640784 is a deficient number, since it is larger than the sum of its proper divisors (2475766).

2640784 is a wasteful number, since it uses less digits than its factorization.

2640784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165057 (or 165051 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 2640784 is about 1625.0489223405. The cubic root of 2640784 is about 138.2221444881. Note that the first 3 decimals are identical.

The spelling of 2640784 in words is "two million, six hundred forty thousand, seven hundred eighty-four".