520978 has 4 divisors (see below), whose sum is σ = 781470. Its totient is φ = 260488.

The previous prime is 520969. The next prime is 520981. The reversal of 520978 is 879025.

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., 514089 + 6889 = 717^2 + 83^2 .

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 an unprimeable number.

520978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130243 + ... + 130246.

2⁵²⁰⁹⁷⁸ is an apocalyptic number.

520978 is a deficient number, since it is larger than the sum of its proper divisors (260492).

520978 is a wasteful number, since it uses less digits than its factorization.

520978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260491.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 520978 is about 721.7880575349. The cubic root of 520978 is about 80.4648973145.

The spelling of 520978 in words is "five hundred twenty thousand, nine hundred seventy-eight".