1647223660 has 48 divisors (see below), whose sum is σ = 3614901696. Its totient is φ = 629311232.

The previous prime is 1647223651. The next prime is 1647223663. The reversal of 1647223660 is 663227461.

It is not an unprimeable number, because it can be changed into a prime (1647223663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364374 + ... + 368866.

It is an arithmetic number, because the mean of its divisors is an integer number (75310452).

Almost surely, 2^1647223660 is an apocalyptic number.

1647223660 is a gapful number since it is divisible by the number (10) 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 1647223660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1807450848).

1647223660 is an abundant number, since it is smaller than the sum of its proper divisors (1967678036).

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

1647223660 is a wasteful number, since it uses less digits than its factorization.

1647223660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5322 (or 5320 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 1647223660 is about 40586.0032523529. The cubic root of 1647223660 is about 1181.0026095214.

The spelling of 1647223660 in words is "one billion, six hundred forty-seven million, two hundred twenty-three thousand, six hundred sixty".