520345345 has 16 divisors (see below), whose sum is σ = 679386960. Its totient is φ = 380289024.

The previous prime is 520345337. The next prime is 520345351. The reversal of 520345345 is 543543025.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 89699841 + 430645504 = 9471^2 + 20752^2 .

It is a cyclic number.

It is not a de Polignac number, because 520345345 - 2³ = 520345337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34960 + ... + 47569.

It is an arithmetic number, because the mean of its divisors is an integer number (42461685).

Almost surely, 2^520345345 is an apocalyptic number.

It is an amenable number.

520345345 is a deficient number, since it is larger than the sum of its proper divisors (159041615).

520345345 is a wasteful number, since it uses less digits than its factorization.

520345345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82644.

The product of its (nonzero) digits is 36000, while the sum is 31.

The square root of 520345345 is about 22811.0794352218. The cubic root of 520345345 is about 804.3231299567.

The spelling of 520345345 in words is "five hundred twenty million, three hundred forty-five thousand, three hundred forty-five".