520642345 has 4 divisors (see below), whose sum is σ = 624770820. Its totient is φ = 416513872.

The previous prime is 520642321. The next prime is 520642349. The reversal of 520642345 is 543246025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131882256 + 388760089 = 11484^2 + 19717^2 .

It is a cyclic number.

It is not a de Polignac number, because 520642345 - 2¹⁹ = 520118057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (520642349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52064230 + ... + 52064239.

It is an arithmetic number, because the mean of its divisors is an integer number (156192705).

Almost surely, 2^520642345 is an apocalyptic number.

It is an amenable number.

520642345 is a deficient number, since it is larger than the sum of its proper divisors (104128475).

520642345 is a wasteful number, since it uses less digits than its factorization.

520642345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104128474.

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 520642345 is about 22817.5885009788. The cubic root of 520642345 is about 804.4761299701.

The spelling of 520642345 in words is "five hundred twenty million, six hundred forty-two thousand, three hundred forty-five".