6721399748 has 24 divisors (see below), whose sum is σ = 13446002304. Its totient is φ = 2879913600.

The previous prime is 6721399693. The next prime is 6721399753. The reversal of 6721399748 is 8479931276.

It is a junction number, because it is equal to n+sod(n) for n = 6721399693 and 6721399702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101393 + ... + 154023.

It is an arithmetic number, because the mean of its divisors is an integer number (560250096).

Almost surely, 2^6721399748 is an apocalyptic number.

It is an amenable number.

6721399748 is an abundant number, since it is smaller than the sum of its proper divisors (6724602556).

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

6721399748 is a wasteful number, since it uses less digits than its factorization.

6721399748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57203 (or 57201 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 56.

The square root of 6721399748 is about 81984.1432717327. The cubic root of 6721399748 is about 1887.2086064970.

The spelling of 6721399748 in words is "six billion, seven hundred twenty-one million, three hundred ninety-nine thousand, seven hundred forty-eight".