521568340 has 12 divisors (see below), whose sum is σ = 1095293556. Its totient is φ = 208627328.

The previous prime is 521568293. The next prime is 521568367. The reversal of 521568340 is 43865125.

It can be written as a sum of positive squares in 2 ways, for example, as 375351876 + 146216464 = 19374^2 + 12092^2 .

It is a junction number, because it is equal to n+sod(n) for n = 521568296 and 521568305.

It is a congruent number.

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, 13039189 + ... + 13039228.

It is an arithmetic number, because the mean of its divisors is an integer number (91274463).

Almost surely, 2^521568340 is an apocalyptic number.

It is an amenable number.

521568340 is an abundant number, since it is smaller than the sum of its proper divisors (573725216).

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

521568340 is a wasteful number, since it uses less digits than its factorization.

521568340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26078426 (or 26078424 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 521568340 is about 22837.8707413804. The cubic root of 521568340 is about 804.9527845460.

The spelling of 521568340 in words is "five hundred twenty-one million, five hundred sixty-eight thousand, three hundred forty".