6721865 has 8 divisors (see below), whose sum is σ = 8417088. Its totient is φ = 5143600.

The previous prime is 6721861. The next prime is 6721867. The reversal of 6721865 is 5681276.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6721865 - 2² = 6721861 is a prime.

It is a Duffinian number.

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, 29111 + ... + 29340.

It is an arithmetic number, because the mean of its divisors is an integer number (1052136).

Almost surely, 2^6721865 is an apocalyptic number.

It is an amenable number.

6721865 is a deficient number, since it is larger than the sum of its proper divisors (1695223).

6721865 is a wasteful number, since it uses less digits than its factorization.

6721865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58479.

The product of its digits is 20160, while the sum is 35.

The square root of 6721865 is about 2592.6559740930. The cubic root of 6721865 is about 188.7252149378.

The spelling of 6721865 in words is "six million, seven hundred twenty-one thousand, eight hundred sixty-five".