720917032 has 96 divisors (see below), whose sum is σ = 1565915400. Its totient is φ = 310464000.

The previous prime is 720917023. The next prime is 720917039. The reversal of 720917032 is 230719027.

It can be written as a sum of positive squares in 4 ways, for example, as 184253476 + 536663556 = 13574^2 + 23166^2 .

It is a junction number, because it is equal to n+sod(n) for n = 720916985 and 720917003.

It is not an unprimeable number, because it can be changed into a prime (720917039) 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 23 ways as a sum of consecutive naturals, for example, 1712182 + ... + 1712602.

Almost surely, 2^720917032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720917032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (782957700).

720917032 is an abundant number, since it is smaller than the sum of its proper divisors (844998368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720917032 is a wasteful number, since it uses less digits than its factorization.

720917032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 720917032 is about 26849.8981748535. The cubic root of 720917032 is about 896.6613056129.

The spelling of 720917032 in words is "seven hundred twenty million, nine hundred seventeen thousand, thirty-two".