6720534 has 12 divisors (see below), whose sum is σ = 14561196. Its totient is φ = 2240172.

The previous prime is 6720533. The next prime is 6720589. The reversal of 6720534 is 4350276.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6720498 and 6720507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186664 + ... + 186699.

It is an arithmetic number, because the mean of its divisors is an integer number (1213433).

Almost surely, 2^6720534 is an apocalyptic number.

6720534 is an abundant number, since it is smaller than the sum of its proper divisors (7840662).

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

6720534 is a wasteful number, since it uses less digits than its factorization.

6720534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373371 (or 373368 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 6720534 is about 2592.3992748032. The cubic root of 6720534 is about 188.7127575894.

The spelling of 6720534 in words is "six million, seven hundred twenty thousand, five hundred thirty-four".