520512690 has 16 divisors (see below), whose sum is σ = 1249230528. Its totient is φ = 138803376.

The previous prime is 520512689. The next prime is 520512697. The reversal of 520512690 is 96215025.

It is a happy number.

It is a super-2 number, since 2×520512690² = 541866920902072200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 17350423 = 520512690 / (5 + 2 + 0 + 5 + 1 + 2 + 6 + 9 + 0).

It is not an unprimeable number, because it can be changed into a prime (520512697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8675182 + ... + 8675241.

It is an arithmetic number, because the mean of its divisors is an integer number (78076908).

Almost surely, 2^520512690 is an apocalyptic number.

520512690 is an abundant number, since it is smaller than the sum of its proper divisors (728717838).

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

520512690 is a wasteful number, since it uses less digits than its factorization.

520512690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17350433.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 520512690 is about 22814.7472043851. The cubic root of 520512690 is about 804.4093451525.

The spelling of 520512690 in words is "five hundred twenty million, five hundred twelve thousand, six hundred ninety".