1218673680 has 320 divisors, whose sum is σ = 4615895040. Its totient is φ = 259780608.

The previous prime is 1218673639. The next prime is 1218673691. The reversal of 1218673680 is 863768121.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2329899 + ... + 2330421.

It is an arithmetic number, because the mean of its divisors is an integer number (14424672).

Almost surely, 2^1218673680 is an apocalyptic number.

1218673680 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 1218673680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2307947520).

1218673680 is an abundant number, since it is smaller than the sum of its proper divisors (3397221360).

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

1218673680 is a wasteful number, since it uses less digits than its factorization.

1218673680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 1218673680 is about 34909.5070145655. The cubic root of 1218673680 is about 1068.1423732540.

The spelling of 1218673680 in words is "one billion, two hundred eighteen million, six hundred seventy-three thousand, six hundred eighty".