2688149 has 4 divisors (see below), whose sum is σ = 2691660. Its totient is φ = 2684640.

The previous prime is 2688143. The next prime is 2688167. The reversal of 2688149 is 9418862.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 70225 + 2617924 = 265^2 + 1618^2 .

It is a cyclic number.

It is not a de Polignac number, because 2688149 - 2¹² = 2684053 is a prime.

It is a super-2 number, since 2×2688149² = 14452290092402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2688143) 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, 62 + ... + 2319.

It is an arithmetic number, because the mean of its divisors is an integer number (672915).

2^2688149 is an apocalyptic number.

It is an amenable number.

2688149 is a deficient number, since it is larger than the sum of its proper divisors (3511).

2688149 is a wasteful number, since it uses less digits than its factorization.

2688149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510.

The product of its digits is 27648, while the sum is 38.

The square root of 2688149 is about 1639.5575622710. The cubic root of 2688149 is about 139.0436348351.

The spelling of 2688149 in words is "two million, six hundred eighty-eight thousand, one hundred forty-nine".