1218657648 has 120 divisors (see below), whose sum is σ = 3609934128. Its totient is φ = 352874496.

The previous prime is 1218657623. The next prime is 1218657677. The reversal of 1218657648 is 8467568121.

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 = 1218657597 and 1218657606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133486 + ... + 142322.

Almost surely, 2^1218657648 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 1218657648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1804967064).

1218657648 is an abundant number, since it is smaller than the sum of its proper divisors (2391276480).

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

1218657648 is a wasteful number, since it uses less digits than its factorization.

1218657648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8891 (or 8872 counting only the distinct ones).

The product of its digits is 645120, while the sum is 48.

The square root of 1218657648 is about 34909.2773915474. The cubic root of 1218657648 is about 1068.1376893276.

The spelling of 1218657648 in words is "one billion, two hundred eighteen million, six hundred fifty-seven thousand, six hundred forty-eight".