2691668 has 36 divisors (see below), whose sum is σ = 5668992. Its totient is φ = 1113840.

The previous prime is 2691659. The next prime is 2691677. The reversal of 2691668 is 8661962.

It is an interprime number because it is at equal distance from previous prime (2691659) and next prime (2691677).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5855 + ... + 6297.

It is an arithmetic number, because the mean of its divisors is an integer number (157472).

2^2691668 is an apocalyptic number.

2691668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2691668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2834496).

2691668 is an abundant number, since it is smaller than the sum of its proper divisors (2977324).

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

2691668 is a wasteful number, since it uses less digits than its factorization.

2691668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 483 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 2691668 is about 1640.6303666579. The cubic root of 2691668 is about 139.1042814235.

The spelling of 2691668 in words is "two million, six hundred ninety-one thousand, six hundred sixty-eight".