2896640639 has 4 divisors (see below), whose sum is σ = 2896749024. Its totient is φ = 2896532256.

The previous prime is 2896640633. The next prime is 2896640671. The reversal of 2896640639 is 9360466982.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9360466982 = 2 ⋅4680233491.

It is a cyclic number.

It is not a de Polignac number, because 2896640639 - 2²⁴ = 2879863423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2896640633) 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, 17594 + ... + 78120.

It is an arithmetic number, because the mean of its divisors is an integer number (724187256).

Almost surely, 2^2896640639 is an apocalyptic number.

2896640639 is a deficient number, since it is larger than the sum of its proper divisors (108385).

2896640639 is an equidigital number, since it uses as much as digits as its factorization.

2896640639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108384.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The square root of 2896640639 is about 53820.4481493791. The cubic root of 2896640639 is about 1425.4922914260.

The spelling of 2896640639 in words is "two billion, eight hundred ninety-six million, six hundred forty thousand, six hundred thirty-nine".