6520345 has 8 divisors (see below), whose sum is σ = 8426376. Its totient is φ = 4814976.

The previous prime is 6520343. The next prime is 6520379. The reversal of 6520345 is 5430256.

It can be written as a sum of positive squares in 4 ways, for example, as 149769 + 6370576 = 387^2 + 2524^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6520345 - 2¹ = 6520343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6520343) 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 7 ways as a sum of consecutive naturals, for example, 50092 + ... + 50221.

It is an arithmetic number, because the mean of its divisors is an integer number (1053297).

Almost surely, 2^6520345 is an apocalyptic number.

6520345 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6520345 is a deficient number, since it is larger than the sum of its proper divisors (1906031).

6520345 is a wasteful number, since it uses less digits than its factorization.

6520345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100331.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 6520345 is about 2553.4966222809. The cubic root of 6520345 is about 186.8200677085.

The spelling of 6520345 in words is "six million, five hundred twenty thousand, three hundred forty-five".