720231424 has 88 divisors (see below), whose sum is σ = 1608254208. Its totient is φ = 319549440.

The previous prime is 720231389. The next prime is 720231427. The reversal of 720231424 is 424132027.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (88).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720231427) 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, 483609 + ... + 485095.

It is an arithmetic number, because the mean of its divisors is an integer number (18275616).

Almost surely, 2^720231424 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 720231424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804127104).

720231424 is an abundant number, since it is smaller than the sum of its proper divisors (888022784).

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

720231424 is a wasteful number, since it uses less digits than its factorization.

720231424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561 (or 1543 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 720231424 is about 26837.1277151636. The cubic root of 720231424 is about 896.3769672296.

The spelling of 720231424 in words is "seven hundred twenty million, two hundred thirty-one thousand, four hundred twenty-four".