2730681 has 6 divisors (see below), whose sum is σ = 3944330. Its totient is φ = 1820448.

The previous prime is 2730677. The next prime is 2730683. The reversal of 2730681 is 1860372.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 826281 = 1380^2 + 909^2 .

It is not a de Polignac number, because 2730681 - 2² = 2730677 is a prime.

It is a super-2 number, since 2×2730681² = 14913237447522, which contains 22 as substring.

It is a Duffinian number.

2730681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2730683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151696 + ... + 151713.

2^2730681 is an apocalyptic number.

It is an amenable number.

2730681 is a deficient number, since it is larger than the sum of its proper divisors (1213649).

2730681 is a wasteful number, since it uses less digits than its factorization.

2730681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303415 (or 303412 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 2730681 is about 1652.4772313106. The cubic root of 2730681 is about 139.7731189144.

The spelling of 2730681 in words is "two million, seven hundred thirty thousand, six hundred eighty-one".