6628749 has 8 divisors (see below), whose sum is σ = 8897472. Its totient is φ = 4389600.

The previous prime is 6628729. The next prime is 6628753. The reversal of 6628749 is 9478266.

6628749 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6628749 - 2⁵ = 6628717 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 6628749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6628729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6864 + ... + 7769.

It is an arithmetic number, because the mean of its divisors is an integer number (1112184).

Almost surely, 2^6628749 is an apocalyptic number.

It is an amenable number.

6628749 is a deficient number, since it is larger than the sum of its proper divisors (2268723).

6628749 is a wasteful number, since it uses less digits than its factorization.

6628749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14787.

The product of its digits is 145152, while the sum is 42.

The square root of 6628749 is about 2574.6357023859. The cubic root of 6628749 is about 187.8497082388.

The spelling of 6628749 in words is "six million, six hundred twenty-eight thousand, seven hundred forty-nine".