6721868 has 24 divisors (see below), whose sum is σ = 12764304. Its totient is φ = 3084800.

The previous prime is 6721867. The next prime is 6721879. The reversal of 6721868 is 8681276.

6721868 = T₅₅₂ + T₅₅₃ + ... + T₅₉₂.

It is not an unprimeable number, because it can be changed into a prime (6721861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1583 + ... + 3993.

It is an arithmetic number, because the mean of its divisors is an integer number (531846).

Almost surely, 2^6721868 is an apocalyptic number.

6721868 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6721868 is a deficient number, since it is larger than the sum of its proper divisors (6042436).

6721868 is a wasteful number, since it uses less digits than its factorization.

6721868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473 (or 2471 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 6721868 is about 2592.6565526502. The cubic root of 6721868 is about 188.7252430141.

The spelling of 6721868 in words is "six million, seven hundred twenty-one thousand, eight hundred sixty-eight".