2787649 has 2 divisors, whose sum is σ = 2787650. Its totient is φ = 2787648.

The previous prime is 2787619. The next prime is 2787689. The reversal of 2787649 is 9467872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2537649 + 250000 = 1593^2 + 500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2787649 is a prime.

It is a d-powerful number, because it can be written as 2³ + 7² + 8 + 7³ + 6⁸ + 4¹⁰ + 9⁵ .

It is not a weakly prime, because it can be changed into another prime (2787619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1393824 + 1393825.

It is an arithmetic number, because the mean of its divisors is an integer number (1393825).

2^2787649 is an apocalyptic number.

It is an amenable number.

2787649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2787649 is an equidigital number, since it uses as much as digits as its factorization.

2787649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 43.

The square root of 2787649 is about 1669.6254070899. The cubic root of 2787649 is about 140.7384282536.

The spelling of 2787649 in words is "two million, seven hundred eighty-seven thousand, six hundred forty-nine".