306730681 has 4 divisors (see below), whose sum is σ = 306966672. Its totient is φ = 306494692.

The previous prime is 306730667. The next prime is 306730727. The reversal of 306730681 is 186037603.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 306730681 - 2⁵ = 306730649 is a prime.

It is a super-2 number, since 2×306730681² = 188167421333447522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (306730181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116035 + ... + 118648.

It is an arithmetic number, because the mean of its divisors is an integer number (76741668).

Almost surely, 2^306730681 is an apocalyptic number.

It is an amenable number.

306730681 is a deficient number, since it is larger than the sum of its proper divisors (235991).

306730681 is a wasteful number, since it uses less digits than its factorization.

306730681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235990.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 306730681 is about 17513.7283580624. The cubic root of 306730681 is about 674.4023468900.

The spelling of 306730681 in words is "three hundred six million, seven hundred thirty thousand, six hundred eighty-one".