720987847 has 8 divisors (see below), whose sum is σ = 734464080. Its totient is φ = 707553600.

The previous prime is 720987781. The next prime is 720987899. The reversal of 720987847 is 748789027.

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 a de Polignac number, because none of the positive numbers 2^k-720987847 is a prime.

It is a super-3 number, since 3×720987847³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720987794 and 720987803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720987247) 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, 25293 + ... + 45625.

It is an arithmetic number, because the mean of its divisors is an integer number (91808010).

Almost surely, 2^720987847 is an apocalyptic number.

720987847 is a deficient number, since it is larger than the sum of its proper divisors (13476233).

720987847 is a wasteful number, since it uses less digits than its factorization.

720987847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20993.

The product of its (nonzero) digits is 1580544, while the sum is 52.

The square root of 720987847 is about 26851.2168625558. The cubic root of 720987847 is about 896.6906640498.

The spelling of 720987847 in words is "seven hundred twenty million, nine hundred eighty-seven thousand, eight hundred forty-seven".