520346640 has 80 divisors (see below), whose sum is σ = 1759726656. Its totient is φ = 126144000.

The previous prime is 520346609. The next prime is 520346663. The reversal of 520346640 is 46643025.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a junction number, because it is equal to n+sod(n) for n = 520346598 and 520346607.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 95911 + ... + 101190.

Almost surely, 2^520346640 is an apocalyptic number.

It is an amenable number.

520346640 is an abundant number, since it is smaller than the sum of its proper divisors (1239380016).

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

520346640 is a wasteful number, since it uses less digits than its factorization.

520346640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197128 (or 197122 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 520346640 is about 22811.1078205334. The cubic root of 520346640 is about 804.3237972043.

Adding to 520346640 its reverse (46643025), we get a palindrome (566989665).

The spelling of 520346640 in words is "five hundred twenty million, three hundred forty-six thousand, six hundred forty".