523521720 has 96 divisors (see below), whose sum is σ = 1737702720. Its totient is φ = 136631040.

The previous prime is 523521697. The next prime is 523521721. The reversal of 523521720 is 27125325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523521721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1450 + ... + 32390.

It is an arithmetic number, because the mean of its divisors is an integer number (18101070).

Almost surely, 2^523521720 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 523521720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (868851360).

523521720 is an abundant number, since it is smaller than the sum of its proper divisors (1214181000).

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

523521720 is a wasteful number, since it uses less digits than its factorization.

523521720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31005 (or 30998 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 523521720 is about 22880.5970201828. The cubic root of 523521720 is about 805.9564368412.

The spelling of 523521720 in words is "five hundred twenty-three million, five hundred twenty-one thousand, seven hundred twenty".