1718643648 has 28 divisors (see below), whose sum is σ = 4547245160. Its totient is φ = 572881152.

The previous prime is 1718643643. The next prime is 1718643659. The reversal of 1718643648 is 8463468171.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 1718643597 and 1718643606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1718643643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4475443 + ... + 4475826.

Almost surely, 2^1718643648 is an apocalyptic number.

It is an amenable number.

1718643648 is an abundant number, since it is smaller than the sum of its proper divisors (2828601512).

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

1718643648 is an equidigital number, since it uses as much as digits as its factorization.

1718643648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8951284 (or 8951274 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 1718643648 is about 41456.5272062193. The cubic root of 1718643648 is about 1197.8302569883.

The spelling of 1718643648 in words is "one billion, seven hundred eighteen million, six hundred forty-three thousand, six hundred forty-eight".