2691656 has 32 divisors (see below), whose sum is σ = 5594400. Its totient is φ = 1203840.

The previous prime is 2691641. The next prime is 2691659. The reversal of 2691656 is 6561962.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2691659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6215 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (174825).

2^2691656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2691656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2797200).

2691656 is an abundant number, since it is smaller than the sum of its proper divisors (2902744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2691656 is a wasteful number, since it uses less digits than its factorization.

2691656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509 (or 505 counting only the distinct ones).

The product of its digits is 19440, while the sum is 35.

The square root of 2691656 is about 1640.6267095229. The cubic root of 2691656 is about 139.1040747049.

The spelling of 2691656 in words is "two million, six hundred ninety-one thousand, six hundred fifty-six".