523661820 has 96 divisors (see below), whose sum is σ = 1625895936. Its totient is φ = 124857600.

The previous prime is 523661819. The next prime is 523661821. The reversal of 523661820 is 28166325.

523661820 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (523661819) and next prime (523661821).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523661821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33757 + ... + 46763.

It is an arithmetic number, because the mean of its divisors is an integer number (16936416).

Almost surely, 2^523661820 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 523661820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812947968).

523661820 is an abundant number, since it is smaller than the sum of its proper divisors (1102234116).

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

523661820 is a wasteful number, since it uses less digits than its factorization.

523661820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13091 (or 13089 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 523661820 is about 22883.6583613722. The cubic root of 523661820 is about 806.0283246105.

The spelling of 523661820 in words is "five hundred twenty-three million, six hundred sixty-one thousand, eight hundred twenty".