7066781 has 8 divisors (see below), whose sum is σ = 7505784. Its totient is φ = 6630400.

The previous prime is 7066777. The next prime is 7066799. The reversal of 7066781 is 1876607.

7066781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3644281 + 3422500 = 1909^2 + 1850^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7066781 - 2² = 7066777 is a prime.

It is a super-2 number, since 2×7066781² = 99878787403922, 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 (7066721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9731 + ... + 10431.

It is an arithmetic number, because the mean of its divisors is an integer number (938223).

Almost surely, 2^7066781 is an apocalyptic number.

It is an amenable number.

7066781 is a deficient number, since it is larger than the sum of its proper divisors (439003).

7066781 is a wasteful number, since it uses less digits than its factorization.

7066781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 7066781 is about 2658.3417763711. The cubic root of 7066781 is about 191.8995152003.

The spelling of 7066781 in words is "seven million, sixty-six thousand, seven hundred eighty-one".