6628906 has 8 divisors (see below), whose sum is σ = 9972900. Its totient is φ = 3304608.

The previous prime is 6628879. The next prime is 6628943. The reversal of 6628906 is 6098266.

It can be written as a sum of positive squares in 2 ways, for example, as 6456681 + 172225 = 2541^2 + 415^2 .

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

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, 4051 + ... + 5446.

Almost surely, 2^6628906 is an apocalyptic number.

6628906 is a deficient number, since it is larger than the sum of its proper divisors (3343994).

6628906 is a wasteful number, since it uses less digits than its factorization.

6628906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9848.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 6628906 is about 2574.6661919558. Note that the first 3 decimals coincide. The cubic root of 6628906 is about 187.8511912824.

The spelling of 6628906 in words is "six million, six hundred twenty-eight thousand, nine hundred six".