6720399860 has 12 divisors (see below), whose sum is σ = 14112839748. Its totient is φ = 2688159936.

The previous prime is 6720399853. The next prime is 6720399869. The reversal of 6720399860 is 689930276.

It can be written as a sum of positive squares in 2 ways, for example, as 3879296656 + 2841103204 = 62284^2 + 53302^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6720399799 and 6720399808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720399869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168009977 + ... + 168010016.

It is an arithmetic number, because the mean of its divisors is an integer number (1176069979).

Almost surely, 2^6720399860 is an apocalyptic number.

It is an amenable number.

6720399860 is an abundant number, since it is smaller than the sum of its proper divisors (7392439888).

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

6720399860 is a wasteful number, since it uses less digits than its factorization.

6720399860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336020002 (or 336020000 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 6720399860 is about 81978.0449876673. The cubic root of 6720399860 is about 1887.1150202953.

The spelling of 6720399860 in words is "six billion, seven hundred twenty million, three hundred ninety-nine thousand, eight hundred sixty".