6520322040 has 128 divisors (see below), whose sum is σ = 20365853760. Its totient is φ = 1668501504.

The previous prime is 6520321999. The next prime is 6520322041. The reversal of 6520322040 is 402230256.

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 6520322040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520322041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 314062 + ... + 334178.

Almost surely, 2^6520322040 is an apocalyptic number.

6520322040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6520322040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10182926880).

6520322040 is an abundant number, since it is smaller than the sum of its proper divisors (13845531720).

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

6520322040 is a wasteful number, since it uses less digits than its factorization.

6520322040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20241 (or 20237 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 6520322040 is about 80748.5110698643. The cubic root of 6520322040 is about 1868.1984842596.

Adding to 6520322040 its reverse (402230256), we get a palindrome (6922552296).

The spelling of 6520322040 in words is "six billion, five hundred twenty million, three hundred twenty-two thousand, forty".