521566044 has 48 divisors (see below), whose sum is σ = 1271262720. Its totient is φ = 166219200.

The previous prime is 521566021. The next prime is 521566051. The reversal of 521566044 is 440665125.

It is a super-2 number, since 2×521566044² = 544062276507619872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 521565996 and 521566014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28569 + ... + 43119.

It is an arithmetic number, because the mean of its divisors is an integer number (26484640).

Almost surely, 2^521566044 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 521566044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (635631360).

521566044 is an abundant number, since it is smaller than the sum of its proper divisors (749696676).

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

521566044 is a wasteful number, since it uses less digits than its factorization.

521566044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14690 (or 14688 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 521566044 is about 22837.8204739419. The cubic root of 521566044 is about 804.9516033814.

The spelling of 521566044 in words is "five hundred twenty-one million, five hundred sixty-six thousand, forty-four".