6781988520 has 64 divisors (see below), whose sum is σ = 22606632000. Its totient is φ = 1808529984.

The previous prime is 6781988467. The next prime is 6781988527. The reversal of 6781988520 is 258891876.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (6781988527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3138730 + ... + 3140889.

It is an arithmetic number, because the mean of its divisors is an integer number (353228625).

Almost surely, 2^6781988520 is an apocalyptic number.

6781988520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6781988520 is an abundant number, since it is smaller than the sum of its proper divisors (15824643480).

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

6781988520 is a wasteful number, since it uses less digits than its factorization.

6781988520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6279639 (or 6279629 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The square root of 6781988520 is about 82352.8294595881. The cubic root of 6781988520 is about 1892.8622793561.

The spelling of 6781988520 in words is "six billion, seven hundred eighty-one million, nine hundred eighty-eight thousand, five hundred twenty".