6720427820 has 24 divisors (see below), whose sum is σ = 14134738464. Its totient is φ = 2684011136.

The previous prime is 6720427801. The next prime is 6720427841. The reversal of 6720427820 is 287240276.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246737 + ... + 272616.

It is an arithmetic number, because the mean of its divisors is an integer number (588947436).

Almost surely, 2^6720427820 is an apocalyptic number.

It is an amenable number.

6720427820 is an abundant number, since it is smaller than the sum of its proper divisors (7414310644).

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

6720427820 is a wasteful number, since it uses less digits than its factorization.

6720427820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520009 (or 520007 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 6720427820 is about 81978.2155209541. The cubic root of 6720427820 is about 1887.1176373847.

The spelling of 6720427820 in words is "six billion, seven hundred twenty million, four hundred twenty-seven thousand, eight hundred twenty".