1216227888 has 240 divisors, whose sum is σ = 3671684640. Its totient is φ = 375238656.

The previous prime is 1216227869. The next prime is 1216227911. The reversal of 1216227888 is 8887226121.

It is a happy number.

1216227888 is a `hidden beast` number, since 12 + 1 + 622 + 7 + 8 + 8 + 8 = 666.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 16660620 + ... + 16660692.

It is an arithmetic number, because the mean of its divisors is an integer number (15298686).

Almost surely, 2^1216227888 is an apocalyptic number.

1216227888 is a gapful number since it is divisible by the number (18) 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 1216227888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1835842320).

1216227888 is an abundant number, since it is smaller than the sum of its proper divisors (2455456752).

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

1216227888 is a wasteful number, since it uses less digits than its factorization.

1216227888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 227 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 1216227888 is about 34874.4589635452. The cubic root of 1216227888 is about 1067.4273325953.

The spelling of 1216227888 in words is "one billion, two hundred sixteen million, two hundred twenty-seven thousand, eight hundred eighty-eight".