1218507648 has 64 divisors (see below), whose sum is σ = 3291580800. Its totient is φ = 399277568.

The previous prime is 1218507629. The next prime is 1218507649. The reversal of 1218507648 is 8467058121.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218507649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4236 + ... + 49547.

It is an arithmetic number, because the mean of its divisors is an integer number (51430950).

Almost surely, 2^1218507648 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 1218507648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1645790400).

1218507648 is an abundant number, since it is smaller than the sum of its proper divisors (2073073152).

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

1218507648 is an equidigital number, since it uses as much as digits as its factorization.

1218507648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53859 (or 53847 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 1218507648 is about 34907.1288994096. The cubic root of 1218507648 is about 1068.0938631752.

The spelling of 1218507648 in words is "one billion, two hundred eighteen million, five hundred seven thousand, six hundred forty-eight".