728651573 has 8 divisors (see below), whose sum is σ = 784912128. Its totient is φ = 672421104.

The previous prime is 728651563. The next prime is 728651587. The reversal of 728651573 is 375156827.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 728651573 - 2⁶ = 728651509 is a prime.

It is a super-2 number, since 2×728651573² = 1061866229670748658, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728651503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85136 + ... + 93302.

It is an arithmetic number, because the mean of its divisors is an integer number (98114016).

Almost surely, 2^728651573 is an apocalyptic number.

It is an amenable number.

728651573 is a deficient number, since it is larger than the sum of its proper divisors (56260555).

728651573 is a wasteful number, since it uses less digits than its factorization.

728651573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15043.

The product of its digits is 352800, while the sum is 44.

The square root of 728651573 is about 26993.5468769852. The cubic root of 728651573 is about 899.8565915534.

The spelling of 728651573 in words is "seven hundred twenty-eight million, six hundred fifty-one thousand, five hundred seventy-three".