520726018 has 4 divisors (see below), whose sum is σ = 781089030. Its totient is φ = 260363008.

The previous prime is 520726013. The next prime is 520726033. The reversal of 520726018 is 810627025.

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

It can be written as a sum of positive squares in only one way, i.e., 431933089 + 88792929 = 20783^2 + 9423^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (520726013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130181503 + ... + 130181506.

Almost surely, 2^520726018 is an apocalyptic number.

520726018 is a deficient number, since it is larger than the sum of its proper divisors (260363012).

520726018 is a wasteful number, since it uses less digits than its factorization.

520726018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260363011.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 520726018 is about 22819.4219471046. The cubic root of 520726018 is about 804.5192237409.

The spelling of 520726018 in words is "five hundred twenty million, seven hundred twenty-six thousand, eighteen".