2640001009 has 4 divisors (see below), whose sum is σ = 2795295204. Its totient is φ = 2484706816.

The previous prime is 2640000997. The next prime is 2640001057. The reversal of 2640001009 is 9001000462.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 716739984 + 1923261025 = 26772^2 + 43855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2640001009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640005009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77647072 + ... + 77647105.

It is an arithmetic number, because the mean of its divisors is an integer number (698823801).

Almost surely, 2^2640001009 is an apocalyptic number.

It is an amenable number.

2640001009 is a deficient number, since it is larger than the sum of its proper divisors (155294195).

2640001009 is a wasteful number, since it uses less digits than its factorization.

2640001009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155294194.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2640001009 is about 51380.9401334775. The cubic root of 2640001009 is about 1382.0848220784.

The spelling of 2640001009 in words is "two billion, six hundred forty million, one thousand, nine".