1218741678 has 192 divisors, whose sum is σ = 3435374592. Its totient is φ = 303114240.

The previous prime is 1218741677. The next prime is 1218741707. The reversal of 1218741678 is 8761478121.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218741677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3452350 + ... + 3452702.

It is an arithmetic number, because the mean of its divisors is an integer number (17892576).

Almost surely, 2^1218741678 is an apocalyptic number.

1218741678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218741678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1717687296).

1218741678 is an abundant number, since it is smaller than the sum of its proper divisors (2216632914).

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

1218741678 is a wasteful number, since it uses less digits than its factorization.

1218741678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479 (or 476 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The square root of 1218741678 is about 34910.4809190593. The cubic root of 1218741678 is about 1068.1622391666.

The spelling of 1218741678 in words is "one billion, two hundred eighteen million, seven hundred forty-one thousand, six hundred seventy-eight".