6520078008 has 96 divisors (see below), whose sum is σ = 18063302400. Its totient is φ = 2123694144.

The previous prime is 6520077947. The next prime is 6520078027. The reversal of 6520078008 is 8008700256.

It is a Cunningham number, because it is equal to 80747²-1.

It is a super-2 number, since 2×6520078008² = 85022834460810496128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2905735 + ... + 2907977.

It is an arithmetic number, because the mean of its divisors is an integer number (188159400).

Almost surely, 2^6520078008 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 6520078008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9031651200).

6520078008 is an abundant number, since it is smaller than the sum of its proper divisors (11543224392).

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

6520078008 is a wasteful number, since it uses less digits than its factorization.

6520078008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3161 (or 3154 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 6520078008 is about 80746.9999938078. Note that the first 5 decimals coincide. The cubic root of 6520078008 is about 1868.1751773382.

The spelling of 6520078008 in words is "six billion, five hundred twenty million, seventy-eight thousand, eight".