521967648 has 24 divisors (see below), whose sum is σ = 1370165328. Its totient is φ = 173989184.

The previous prime is 521967637. The next prime is 521967653. The reversal of 521967648 is 846769125.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 521967597 and 521967606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2718486 + ... + 2718677.

It is an arithmetic number, because the mean of its divisors is an integer number (57090222).

Almost surely, 2^521967648 is an apocalyptic number.

It is an amenable number.

521967648 is an abundant number, since it is smaller than the sum of its proper divisors (848197680).

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

521967648 is a wasteful number, since it uses less digits than its factorization.

521967648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5437176 (or 5437168 counting only the distinct ones).

The product of its digits is 725760, while the sum is 48.

The square root of 521967648 is about 22846.6113023354. The cubic root of 521967648 is about 805.1581536672.

The spelling of 521967648 in words is "five hundred twenty-one million, nine hundred sixty-seven thousand, six hundred forty-eight".