6721536 has 52 divisors (see below), whose sum is σ = 17954672. Its totient is φ = 2236416.

The previous prime is 6721523. The next prime is 6721541. The reversal of 6721536 is 6351276.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12015 + ... + 12561.

Almost surely, 2^6721536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6721536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8977336).

6721536 is an abundant number, since it is smaller than the sum of its proper divisors (11233136).

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

6721536 is an equidigital number, since it uses as much as digits as its factorization.

6721536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 552 counting only the distinct ones).

The product of its digits is 7560, while the sum is 30.

The square root of 6721536 is about 2592.5925248677. The cubic root of 6721536 is about 188.7221358514.

The spelling of 6721536 in words is "six million, seven hundred twenty-one thousand, five hundred thirty-six".