6647430720 has 224 divisors, whose sum is σ = 24284123136. Its totient is φ = 1509120000.

The previous prime is 6647430707. The next prime is 6647430733. The reversal of 6647430720 is 270347466.

It is an interprime number because it is at equal distance from previous prime (6647430707) and next prime (6647430733).

It is a tau number, because it is divible by the number of its divisors (224).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1011445 + ... + 1017995.

It is an arithmetic number, because the mean of its divisors is an integer number (108411264).

Almost surely, 2^6647430720 is an apocalyptic number.

6647430720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6647430720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12142061568).

6647430720 is an abundant number, since it is smaller than the sum of its proper divisors (17636692416).

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

6647430720 is a wasteful number, since it uses less digits than its factorization.

6647430720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6729 (or 6719 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 39.

The square root of 6647430720 is about 81531.7773631852. Note that the first 3 decimals coincide. The cubic root of 6647430720 is about 1880.2601420610.

The spelling of 6647430720 in words is "six billion, six hundred forty-seven million, four hundred thirty thousand, seven hundred twenty".