520065390 has 96 divisors (see below), whose sum is σ = 1372622976. Its totient is φ = 126023040.

The previous prime is 520065389. The next prime is 520065391. The reversal of 520065390 is 93560025.

520065390 = 2753² + 2754² + ... + 2819².

It is an interprime number because it is at equal distance from previous prime (520065389) and next prime (520065391).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520065391) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 338925 + ... + 340455.

It is an arithmetic number, because the mean of its divisors is an integer number (14298156).

Almost surely, 2^520065390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520065390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (686311488).

520065390 is an abundant number, since it is smaller than the sum of its proper divisors (852557586).

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

520065390 is a wasteful number, since it uses less digits than its factorization.

520065390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634 (or 1621 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 520065390 is about 22804.9422275085. The cubic root of 520065390 is about 804.1788573893.

The spelling of 520065390 in words is "five hundred twenty million, sixty-five thousand, three hundred ninety".