6721633 has 4 divisors (see below), whose sum is σ = 6784560. Its totient is φ = 6658708.

The previous prime is 6721609. The next prime is 6721661. The reversal of 6721633 is 3361276.

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 6721633 - 2²¹ = 4624481 is a prime.

It is a Duffinian number.

6721633 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6721133) 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, 31303 + ... + 31516.

It is an arithmetic number, because the mean of its divisors is an integer number (1696140).

Almost surely, 2^6721633 is an apocalyptic number.

It is an amenable number.

6721633 is a deficient number, since it is larger than the sum of its proper divisors (62927).

6721633 is a wasteful number, since it uses less digits than its factorization.

6721633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62926.

The product of its digits is 4536, while the sum is 28.

The square root of 6721633 is about 2592.6112319436. The cubic root of 6721633 is about 188.7230436776.

The spelling of 6721633 in words is "six million, seven hundred twenty-one thousand, six hundred thirty-three".