6721552 has 10 divisors (see below), whose sum is σ = 13023038. Its totient is φ = 3360768.

The previous prime is 6721549. The next prime is 6721553. The reversal of 6721552 is 2551276.

It can be written as a sum of positive squares in only one way, i.e., 6574096 + 147456 = 2564^2 + 384^2 .

It is a super-2 number, since 2×6721552² = 90358522577408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6721552.

It is not an unprimeable number, because it can be changed into a prime (6721553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210033 + ... + 210064.

Almost surely, 2^6721552 is an apocalyptic number.

It is an amenable number.

6721552 is a deficient number, since it is larger than the sum of its proper divisors (6301486).

6721552 is a wasteful number, since it uses less digits than its factorization.

6721552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420105 (or 420099 counting only the distinct ones).

The product of its digits is 4200, while the sum is 28.

The square root of 6721552 is about 2592.5956105803. The cubic root of 6721552 is about 188.7222855965.

The spelling of 6721552 in words is "six million, seven hundred twenty-one thousand, five hundred fifty-two".