521894016 has 448 divisors, whose sum is σ = 1926478080. Its totient is φ = 137355264.

The previous prime is 521893973. The next prime is 521894041. The reversal of 521894016 is 610498125.

521894016 is a `hidden beast` number, since 521 + 89 + 40 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 11104105 + ... + 11104151.

Almost surely, 2^521894016 is an apocalyptic number.

521894016 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521894016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963239040).

521894016 is an abundant number, since it is smaller than the sum of its proper divisors (1404584064).

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

521894016 is an equidigital number, since it uses as much as digits as its factorization.

521894016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 521894016 is about 22844.9998030204. Note that the first 3 decimals coincide. The cubic root of 521894016 is about 805.1202916827.

The spelling of 521894016 in words is "five hundred twenty-one million, eight hundred ninety-four thousand, sixteen".