6720001 has 4 divisors (see below), whose sum is σ = 6761392. Its totient is φ = 6678612.

The previous prime is 6719989. The next prime is 6720011. The reversal of 6720001 is 1000276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6720001 - 2⁵ = 6719969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6720011) 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, 20451 + ... + 20776.

It is an arithmetic number, because the mean of its divisors is an integer number (1690348).

Almost surely, 2^6720001 is an apocalyptic number.

It is an amenable number.

6720001 is a deficient number, since it is larger than the sum of its proper divisors (41391).

6720001 is a wasteful number, since it uses less digits than its factorization.

6720001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41390.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 6720001 is about 2592.2964722423. The cubic root of 6720001 is about 188.7077685732.

Adding to 6720001 its reverse (1000276), we get a palindrome (7720277).

The spelling of 6720001 in words is "six million, seven hundred twenty thousand, one".