730438721 has 8 divisors (see below), whose sum is σ = 747826464. Its totient is φ = 713069280.

The previous prime is 730438673. The next prime is 730438727. The reversal of 730438721 is 127834037.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-730438721 is a prime.

It is a super-2 number, since 2×730438721² = 1067081450272231682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (730438727) 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 7 ways as a sum of consecutive naturals, for example, 109286 + ... + 115776.

It is an arithmetic number, because the mean of its divisors is an integer number (93478308).

Almost surely, 2^730438721 is an apocalyptic number.

It is an amenable number.

730438721 is a deficient number, since it is larger than the sum of its proper divisors (17387743).

730438721 is a wasteful number, since it uses less digits than its factorization.

730438721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9151.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 730438721 is about 27026.6298490951. The cubic root of 730438721 is about 900.5916771900.

The spelling of 730438721 in words is "seven hundred thirty million, four hundred thirty-eight thousand, seven hundred twenty-one".