6631977728 has 36 divisors (see below), whose sum is σ = 13274308320. Its totient is φ = 3306906624.

The previous prime is 6631977713. The next prime is 6631977733. The reversal of 6631977728 is 8277791366.

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, 58658 + ... + 129246.

Almost surely, 2^6631977728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6631977728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6637154160).

6631977728 is an abundant number, since it is smaller than the sum of its proper divisors (6642330592).

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

6631977728 is an equidigital number, since it uses as much as digits as its factorization.

6631977728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70972 (or 70958 counting only the distinct ones).

The product of its digits is 5334336, while the sum is 56.

The square root of 6631977728 is about 81436.9555423089. The cubic root of 6631977728 is about 1878.8020253802.

The spelling of 6631977728 in words is "six billion, six hundred thirty-one million, nine hundred seventy-seven thousand, seven hundred twenty-eight".