2687696649 has 27 divisors (see below), whose sum is σ = 4269960877. Its totient is φ = 1627870200.

The previous prime is 2687696611. The next prime is 2687696663. The reversal of 2687696649 is 9466967862.

The square root of 2687696649 is 51843.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2687696649 - 2¹⁷ = 2687565577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2687696149) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1710034 + ... + 1711604.

Almost surely, 2^2687696649 is an apocalyptic number.

2687696649 is the 51843-rd square number.

2687696649 is the 25922-nd centered octagonal number.

It is an amenable number.

2687696649 is a deficient number, since it is larger than the sum of its proper divisors (1582264228).

2687696649 is an equidigital number, since it uses as much as digits as its factorization.

2687696649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3170 (or 1585 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 63.

The cubic root of 2687696649 is about 1390.3583516139.

The spelling of 2687696649 in words is "two billion, six hundred eighty-seven million, six hundred ninety-six thousand, six hundred forty-nine".