521995752 has 80 divisors (see below), whose sum is σ = 1465757700. Its totient is φ = 173560320.

The previous prime is 521995751. The next prime is 521995753. The reversal of 521995752 is 257599125.

It is an interprime number because it is at equal distance from previous prime (521995751) and next prime (521995753).

It can be written as a sum of positive squares in 2 ways, for example, as 500595876 + 21399876 = 22374^2 + 4626^2 .

It is a junction number, because it is equal to n+sod(n) for n = 521995698 and 521995707.

It is not an unprimeable number, because it can be changed into a prime (521995751) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 349824 + ... + 351312.

Almost surely, 2^521995752 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 521995752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732878850).

521995752 is an abundant number, since it is smaller than the sum of its proper divisors (943761948).

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

521995752 is a wasteful number, since it uses less digits than its factorization.

521995752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048 (or 2035 counting only the distinct ones).

The product of its digits is 283500, while the sum is 45.

The square root of 521995752 is about 22847.2263524481. The cubic root of 521995752 is about 805.1726039617.

The spelling of 521995752 in words is "five hundred twenty-one million, nine hundred ninety-five thousand, seven hundred fifty-two".