2640509426 has 16 divisors (see below), whose sum is σ = 4029271584. Its totient is φ = 1297547424.

The previous prime is 2640509419. The next prime is 2640509437. The reversal of 2640509426 is 6249050462.

It is a self number, because there is not a number n which added to its sum of digits gives 2640509426.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9365 + ... + 73271.

It is an arithmetic number, because the mean of its divisors is an integer number (251829474).

Almost surely, 2^2640509426 is an apocalyptic number.

2640509426 is a deficient number, since it is larger than the sum of its proper divisors (1388762158).

2640509426 is a wasteful number, since it uses less digits than its factorization.

2640509426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64265.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 2640509426 is about 51385.8874205749. The cubic root of 2640509426 is about 1382.1735379935.

Adding to 2640509426 its reverse (6249050462), we get a palindrome (8889559888).

The spelling of 2640509426 in words is "two billion, six hundred forty million, five hundred nine thousand, four hundred twenty-six".