6651988 has 12 divisors (see below), whose sum is σ = 13304032. Its totient is φ = 2850840.

The previous prime is 6651959. The next prime is 6652001. The reversal of 6651988 is 8891566.

6651988 is an admirable number.

It is a congruent number.

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, 118758 + ... + 118813.

Almost surely, 2^6651988 is an apocalyptic number.

It is an amenable number.

6651988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6651988 is a wasteful number, since it uses less digits than its factorization.

6651988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237582 (or 237580 counting only the distinct ones).

The product of its digits is 103680, while the sum is 43.

The square root of 6651988 is about 2579.1448195090. The cubic root of 6651988 is about 188.0689727308.

The spelling of 6651988 in words is "six million, six hundred fifty-one thousand, nine hundred eighty-eight".