6720487 has 4 divisors (see below), whose sum is σ = 6730776. Its totient is φ = 6710200.

The previous prime is 6720481. The next prime is 6720499. The reversal of 6720487 is 7840276.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6720487 is a prime.

It is a Duffinian number.

6720487 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720481) 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, 4093 + ... + 5494.

It is an arithmetic number, because the mean of its divisors is an integer number (1682694).

Almost surely, 2^6720487 is an apocalyptic number.

6720487 is a deficient number, since it is larger than the sum of its proper divisors (10289).

6720487 is an equidigital number, since it uses as much as digits as its factorization.

6720487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10288.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 6720487 is about 2592.3902098257. The cubic root of 6720487 is about 188.7123176680.

The spelling of 6720487 in words is "six million, seven hundred twenty thousand, four hundred eighty-seven".