2688651 has 12 divisors (see below), whose sum is σ = 4438512. Its totient is φ = 1536336.

The previous prime is 2688629. The next prime is 2688659. The reversal of 2688651 is 1568862.

It is a happy number.

It is not a de Polignac number, because 2688651 - 2⁷ = 2688523 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2688659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21276 + ... + 21401.

It is an arithmetic number, because the mean of its divisors is an integer number (369876).

2^2688651 is an apocalyptic number.

2688651 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2688651 is a deficient number, since it is larger than the sum of its proper divisors (1749861).

2688651 is a wasteful number, since it uses less digits than its factorization.

2688651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42690 (or 42687 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2688651 is about 1639.7106452054. The cubic root of 2688651 is about 139.0522895588.

The spelling of 2688651 in words is "two million, six hundred eighty-eight thousand, six hundred fifty-one".