6909721632 has 192 divisors, whose sum is σ = 22037097600. Its totient is φ = 2088944640.

The previous prime is 6909721631. The next prime is 6909721661. The reversal of 6909721632 is 2361279096.

It is a happy number.

6909721632 is a `hidden beast` number, since 6 + 9 + 0 + 9 + 7 + 2 + 1 + 632 = 666.

It is not an unprimeable number, because it can be changed into a prime (6909721631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7878378 + ... + 7879254.

It is an arithmetic number, because the mean of its divisors is an integer number (114776550).

Almost surely, 2^6909721632 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 6909721632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11018548800).

6909721632 is an abundant number, since it is smaller than the sum of its proper divisors (15127375968).

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

6909721632 is a wasteful number, since it uses less digits than its factorization.

6909721632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736 (or 1722 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 6909721632 is about 83124.7353800299. The cubic root of 6909721632 is about 1904.6719405322.

The spelling of 6909721632 in words is "six billion, nine hundred nine million, seven hundred twenty-one thousand, six hundred thirty-two".