523404644 has 48 divisors (see below), whose sum is σ = 1100762880. Its totient is φ = 213010560.

The previous prime is 523404641. The next prime is 523404659. The reversal of 523404644 is 446404325.

It is a self number, because there is not a number n which added to its sum of digits gives 523404644.

It is not an unprimeable number, because it can be changed into a prime (523404641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44249 + ... + 54815.

It is an arithmetic number, because the mean of its divisors is an integer number (22932560).

Almost surely, 2^523404644 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 523404644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (550381440).

523404644 is an abundant number, since it is smaller than the sum of its proper divisors (577358236).

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

523404644 is a wasteful number, since it uses less digits than its factorization.

523404644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10668 (or 10666 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 32.

The square root of 523404644 is about 22878.0384648684. The cubic root of 523404644 is about 805.8963532529.

Adding to 523404644 its reverse (446404325), we get a palindrome (969808969).

The spelling of 523404644 in words is "five hundred twenty-three million, four hundred four thousand, six hundred forty-four".