720531680 has 192 divisors, whose sum is σ = 2024870400. Its totient is φ = 239339520.

The previous prime is 720531671. The next prime is 720531701. The reversal of 720531680 is 86135027.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 969389 + ... + 970131.

It is an arithmetic number, because the mean of its divisors is an integer number (10546200).

Almost surely, 2^720531680 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 720531680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1012435200).

720531680 is an abundant number, since it is smaller than the sum of its proper divisors (1304338720).

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

720531680 is a wasteful number, since it uses less digits than its factorization.

720531680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 720531680 is about 26842.7211735323. The cubic root of 720531680 is about 896.5015129249.

The spelling of 720531680 in words is "seven hundred twenty million, five hundred thirty-one thousand, six hundred eighty".