520214640 has 160 divisors (see below), whose sum is σ = 1777600512. Its totient is φ = 124800000.

The previous prime is 520214593. The next prime is 520214641. The reversal of 520214640 is 46412025.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 520214640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520214641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 265665 + ... + 267615.

Almost surely, 2^520214640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520214640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (888800256).

520214640 is an abundant number, since it is smaller than the sum of its proper divisors (1257385872).

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

520214640 is a wasteful number, since it uses less digits than its factorization.

520214640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079 (or 2073 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 520214640 is about 22808.2143097613. The cubic root of 520214640 is about 804.2557786233.

Adding to 520214640 its reverse (46412025), we get a palindrome (566626665).

The spelling of 520214640 in words is "five hundred twenty million, two hundred fourteen thousand, six hundred forty".