1218178864 has 40 divisors (see below), whose sum is σ = 2702327040. Its totient is φ = 521122368.

The previous prime is 1218178859. The next prime is 1218178889. The reversal of 1218178864 is 4688718121.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53397 + ... + 72715.

It is an arithmetic number, because the mean of its divisors is an integer number (67558176).

Almost surely, 2^1218178864 is an apocalyptic number.

1218178864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1218178864 is an abundant number, since it is smaller than the sum of its proper divisors (1484148176).

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

1218178864 is a wasteful number, since it uses less digits than its factorization.

1218178864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19897 (or 19891 counting only the distinct ones).

The product of its digits is 172032, while the sum is 46.

The square root of 1218178864 is about 34902.4191711692. The cubic root of 1218178864 is about 1067.9977883405.

The spelling of 1218178864 in words is "one billion, two hundred eighteen million, one hundred seventy-eight thousand, eight hundred sixty-four".