6631988 has 24 divisors (see below), whose sum is σ = 13329120. Its totient is φ = 2855520.

The previous prime is 6631979. The next prime is 6631993. The reversal of 6631988 is 8891366.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3131 + ... + 4802.

It is an arithmetic number, because the mean of its divisors is an integer number (555380).

Almost surely, 2^6631988 is an apocalyptic number.

It is an amenable number.

6631988 is an abundant number, since it is smaller than the sum of its proper divisors (6697132).

6631988 is a wasteful number, since it uses less digits than its factorization.

6631988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7967 (or 7965 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 6631988 is about 2575.2646465946. The cubic root of 6631988 is about 187.8802995380.

The spelling of 6631988 in words is "six million, six hundred thirty-one thousand, nine hundred eighty-eight".