1216563480 has 384 divisors, whose sum is σ = 4528742400. Its totient is φ = 280627200.

The previous prime is 1216563479. The next prime is 1216563493. The reversal of 1216563480 is 843656121.

It is a happy number.

1216563480 is a `hidden beast` number, since 1 + 2 + 16 + 5 + 634 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9579177 + ... + 9579303.

It is an arithmetic number, because the mean of its divisors is an integer number (11793600).

Almost surely, 2^1216563480 is an apocalyptic number.

1216563480 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 1216563480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2264371200).

1216563480 is an abundant number, since it is smaller than the sum of its proper divisors (3312178920).

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

1216563480 is a wasteful number, since it uses less digits than its factorization.

1216563480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1216563480 is about 34879.2700611696. The cubic root of 1216563480 is about 1067.5255014594.

The spelling of 1216563480 in words is "one billion, two hundred sixteen million, five hundred sixty-three thousand, four hundred eighty".