730681 has 4 divisors (see below), whose sum is σ = 835072. Its totient is φ = 626292.

The previous prime is 730679. The next prime is 730727. The reversal of 730681 is 186037.

730681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 730681 - 2¹ = 730679 is a prime.

It is a super-2 number, since 2×730681² = 1067789447522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (730781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52185 + ... + 52198.

It is an arithmetic number, because the mean of its divisors is an integer number (208768).

2⁷³⁰⁶⁸¹ is an apocalyptic number.

It is an amenable number.

730681 is a deficient number, since it is larger than the sum of its proper divisors (104391).

730681 is a wasteful number, since it uses less digits than its factorization.

730681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104390.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 730681 is about 854.7988067376. The cubic root of 730681 is about 90.0691238511.

Subtracting from 730681 its reverse (186037), we obtain a square (544644 = 738²).

The spelling of 730681 in words is "seven hundred thirty thousand, six hundred eighty-one".