1216178880 has 224 divisors, whose sum is σ = 4476902400. Its totient is φ = 273960960.

The previous prime is 1216178879. The next prime is 1216178897. The reversal of 1216178880 is 888716121.

It is a tau number, because it is divible by the number of its divisors (224).

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 31 ways as a sum of consecutive naturals, for example, 475846 + ... + 478394.

Almost surely, 2^1216178880 is an apocalyptic number.

1216178880 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 1216178880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2238451200).

1216178880 is an abundant number, since it is smaller than the sum of its proper divisors (3260723520).

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

1216178880 is a wasteful number, since it uses less digits than its factorization.

1216178880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647 (or 2637 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 42.

The square root of 1216178880 is about 34873.7563219106. The cubic root of 1216178880 is about 1067.4129950461.

The spelling of 1216178880 in words is "one billion, two hundred sixteen million, one hundred seventy-eight thousand, eight hundred eighty".