521630676 has 108 divisors (see below), whose sum is σ = 1583487360. Its totient is φ = 144214560.

The previous prime is 521630633. The next prime is 521630677. The reversal of 521630676 is 676036125.

521630676 is a `hidden beast` number, since 521 + 63 + 0 + 6 + 76 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 521630676.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521630677) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 49915 + ... + 59453.

It is an arithmetic number, because the mean of its divisors is an integer number (14661920).

Almost surely, 2^521630676 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 521630676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (791743680).

521630676 is an abundant number, since it is smaller than the sum of its proper divisors (1061856684).

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

521630676 is a wasteful number, since it uses less digits than its factorization.

521630676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9594 (or 9582 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 521630676 is about 22839.2354513018. The cubic root of 521630676 is about 804.9848516368.

The spelling of 521630676 in words is "five hundred twenty-one million, six hundred thirty thousand, six hundred seventy-six".