2067681 has 16 divisors (see below), whose sum is σ = 3437568. Its totient is φ = 1074000.

The previous prime is 2067679. The next prime is 2067691. The reversal of 2067681 is 1867602.

It is a happy number.

It is not a de Polignac number, because 2067681 - 2¹ = 2067679 is a prime.

It is a super-2 number, since 2×2067681² = 8550609435522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2067661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4245 + ... + 4706.

It is an arithmetic number, because the mean of its divisors is an integer number (214848).

2^2067681 is an apocalyptic number.

2067681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2067681 is a deficient number, since it is larger than the sum of its proper divisors (1369887).

2067681 is a wasteful number, since it uses less digits than its factorization.

2067681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8972.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 2067681 is about 1437.9433229443. The cubic root of 2067681 is about 127.3975801865.

It can be divided in two parts, 206 and 7681, that added together give a palindrome (7887).

The spelling of 2067681 in words is "two million, sixty-seven thousand, six hundred eighty-one".