521193648 has 40 divisors (see below), whose sum is σ = 1350703728. Its totient is φ = 173178112.

The previous prime is 521193643. The next prime is 521193671. The reversal of 521193648 is 846391125.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (521193643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1911 + ... + 32342.

Almost surely, 2^521193648 is an apocalyptic number.

It is an amenable number.

521193648 is an abundant number, since it is smaller than the sum of its proper divisors (829510080).

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

521193648 is a wasteful number, since it uses less digits than its factorization.

521193648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34581 (or 34575 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 521193648 is about 22829.6659633907. The cubic root of 521193648 is about 804.7599803954.

The spelling of 521193648 in words is "five hundred twenty-one million, one hundred ninety-three thousand, six hundred forty-eight".