520289978 has 8 divisors (see below), whose sum is σ = 840468468. Its totient is φ = 240133824.

The previous prime is 520289951. The next prime is 520290013. The reversal of 520289978 is 879982025.

It can be written as a sum of positive squares in 2 ways, for example, as 519520849 + 769129 = 22793^2 + 877^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×520289978² = 541403322414480968, which contains 22 as substring.

It is a Curzon 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, 10005551 + ... + 10005602.

Almost surely, 2^520289978 is an apocalyptic number.

520289978 is a deficient number, since it is larger than the sum of its proper divisors (320178490).

520289978 is a wasteful number, since it uses less digits than its factorization.

520289978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20011168.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 520289978 is about 22809.8658040770. The cubic root of 520289978 is about 804.2946011224.

The spelling of 520289978 in words is "five hundred twenty million, two hundred eighty-nine thousand, nine hundred seventy-eight".