2897648639 has 2 divisors, whose sum is σ = 2897648640. Its totient is φ = 2897648638.

The previous prime is 2897648617. The next prime is 2897648671. The reversal of 2897648639 is 9368467982.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2897648639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2897648239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1448824319 + 1448824320.

It is an arithmetic number, because the mean of its divisors is an integer number (1448824320).

Almost surely, 2^2897648639 is an apocalyptic number.

2897648639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2897648639 is an equidigital number, since it uses as much as digits as its factorization.

2897648639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 62.

The square root of 2897648639 is about 53829.8118053556. The cubic root of 2897648639 is about 1425.6576242795.

The spelling of 2897648639 in words is "two billion, eight hundred ninety-seven million, six hundred forty-eight thousand, six hundred thirty-nine".