521444004 has 24 divisors (see below), whose sum is σ = 1219135680. Its totient is φ = 173467104.

The previous prime is 521443987. The next prime is 521444039. The reversal of 521444004 is 400444125.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37159 + ... + 49230.

It is an arithmetic number, because the mean of its divisors is an integer number (50797320).

Almost surely, 2^521444004 is an apocalyptic number.

It is an amenable number.

521444004 is an abundant number, since it is smaller than the sum of its proper divisors (697691676).

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

521444004 is a wasteful number, since it uses less digits than its factorization.

521444004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86899 (or 86897 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 521444004 is about 22835.1484339384. The cubic root of 521444004 is about 804.8888155792. Note that the first 4 decimals are identical.

Adding to 521444004 its reverse (400444125), we get a palindrome (921888129).

The spelling of 521444004 in words is "five hundred twenty-one million, four hundred forty-four thousand, four".