728657722 has 8 divisors (see below), whose sum is σ = 1177062516. Its totient is φ = 336303552.

The previous prime is 728657719. The next prime is 728657737. The reversal of 728657722 is 227756827.

It can be written as a sum of positive squares in 2 ways, for example, as 728514081 + 143641 = 26991^2 + 379^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14012623 + ... + 14012674.

Almost surely, 2^728657722 is an apocalyptic number.

728657722 is a deficient number, since it is larger than the sum of its proper divisors (448404794).

728657722 is a wasteful number, since it uses less digits than its factorization.

728657722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28025312.

The product of its digits is 658560, while the sum is 46.

The square root of 728657722 is about 26993.6607743374. The cubic root of 728657722 is about 899.8591228056.

The spelling of 728657722 in words is "seven hundred twenty-eight million, six hundred fifty-seven thousand, seven hundred twenty-two".