515664820 has 48 divisors (see below), whose sum is σ = 1184012928. Its totient is φ = 187090560.

The previous prime is 515664803. The next prime is 515664829. The reversal of 515664820 is 28466515.

It is a self number, because there is not a number n which added to its sum of digits gives 515664820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515664829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104734 + ... + 109546.

It is an arithmetic number, because the mean of its divisors is an integer number (24666936).

Almost surely, 2^515664820 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 515664820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (592006464).

515664820 is an abundant number, since it is smaller than the sum of its proper divisors (668348108).

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

515664820 is a wasteful number, since it uses less digits than its factorization.

515664820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5320 (or 5318 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 515664820 is about 22708.2544463462. The cubic root of 515664820 is about 801.9042242330.

The spelling of 515664820 in words is "five hundred fifteen million, six hundred sixty-four thousand, eight hundred twenty".