6628978 has 12 divisors (see below), whose sum is σ = 10277550. Its totient is φ = 3206640.

The previous prime is 6628943. The next prime is 6628981. The reversal of 6628978 is 8798266.

It can be written as a sum of positive squares in only one way, i.e., 6620329 + 8649 = 2573^2 + 93^2 .

It is a d-powerful number, because it can be written as 6⁵ + 6⁸ + 2¹³ + 8 + 9⁷ + 7⁶ + 8⁵ .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 198 + ... + 3646.

Almost surely, 2^6628978 is an apocalyptic number.

6628978 is a deficient number, since it is larger than the sum of its proper divisors (3648572).

6628978 is a wasteful number, since it uses less digits than its factorization.

6628978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3513 (or 3482 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 6628978 is about 2574.6801743129. The cubic root of 6628978 is about 187.8518713965.

The spelling of 6628978 in words is "six million, six hundred twenty-eight thousand, nine hundred seventy-eight".