521649696 has 48 divisors (see below), whose sum is σ = 1376331264. Its totient is φ = 172994304.

The previous prime is 521649677. The next prime is 521649701. The reversal of 521649696 is 696946125.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5121 + ... + 32703.

It is an arithmetic number, because the mean of its divisors is an integer number (28673568).

Almost surely, 2^521649696 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 521649696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (688165632).

521649696 is an abundant number, since it is smaller than the sum of its proper divisors (854681568).

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

521649696 is a wasteful number, since it uses less digits than its factorization.

521649696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27793 (or 27785 counting only the distinct ones).

The product of its digits is 699840, while the sum is 48.

The square root of 521649696 is about 22839.6518362255. The cubic root of 521649696 is about 804.9946354593.

The spelling of 521649696 in words is "five hundred twenty-one million, six hundred forty-nine thousand, six hundred ninety-six".