520678890 has 96 divisors (see below), whose sum is σ = 1460671056. Its totient is φ = 128194560.

The previous prime is 520678889. The next prime is 520678891. The reversal of 520678890 is 98876025.

It is an interprime number because it is at equal distance from previous prime (520678889) and next prime (520678891).

It can be written as a sum of positive squares in 8 ways, for example, as 299532249 + 221146641 = 17307^2 + 14871^2 .

It is a super-2 number, since 2×520678890² = 542213012983264200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (520678891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77880 + ... + 84300.

Almost surely, 2^520678890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520678890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (730335528).

520678890 is an abundant number, since it is smaller than the sum of its proper divisors (939992166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

520678890 is a wasteful number, since it uses less digits than its factorization.

520678890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6504 (or 6501 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 520678890 is about 22818.3892946018. The cubic root of 520678890 is about 804.4949521632.

The spelling of 520678890 in words is "five hundred twenty million, six hundred seventy-eight thousand, eight hundred ninety".