728847917 has 8 divisors (see below), whose sum is σ = 843513600. Its totient is φ = 616818384.

The previous prime is 728847907. The next prime is 728847929. The reversal of 728847917 is 719748827.

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

It is not a de Polignac number, because 728847917 - 2⁸ = 728847661 is a prime.

It is a super-2 number, since 2×728847917² = 1062438572230477778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728847907) 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, 658442 + ... + 659547.

It is an arithmetic number, because the mean of its divisors is an integer number (105439200).

Almost surely, 2^728847917 is an apocalyptic number.

It is an amenable number.

728847917 is a deficient number, since it is larger than the sum of its proper divisors (114665683).

728847917 is a wasteful number, since it uses less digits than its factorization.

728847917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318075.

The product of its digits is 1580544, while the sum is 53.

The square root of 728847917 is about 26997.1835012469. The cubic root of 728847917 is about 899.9374100506.

The spelling of 728847917 in words is "seven hundred twenty-eight million, eight hundred forty-seven thousand, nine hundred seventeen".