730640181 has 16 divisors (see below), whose sum is σ = 1018180800. Its totient is φ = 465443328.

The previous prime is 730640179. The next prime is 730640201. The reversal of 730640181 is 181046037.

It is a happy number.

It is not a de Polignac number, because 730640181 - 2¹ = 730640179 is a prime.

It is a super-2 number, since 2×730640181² = 1067670148183425522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730640171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34851 + ... + 51728.

It is an arithmetic number, because the mean of its divisors is an integer number (63636300).

Almost surely, 2^730640181 is an apocalyptic number.

It is an amenable number.

730640181 is a deficient number, since it is larger than the sum of its proper divisors (287540619).

730640181 is a wasteful number, since it uses less digits than its factorization.

730640181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86708.

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

The square root of 730640181 is about 27030.3566569145. The cubic root of 730640181 is about 900.6744660293.

The spelling of 730640181 in words is "seven hundred thirty million, six hundred forty thousand, one hundred eighty-one".