1216097280 has 352 divisors, whose sum is σ = 4559078400. Its totient is φ = 306561024.

The previous prime is 1216097257. The next prime is 1216097341. The reversal of 1216097280 is 827906121.

1216097280 is a `hidden beast` number, since 1 + 21 + 609 + 7 + 28 + 0 = 666.

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

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, 2626329 + ... + 2626791.

Almost surely, 2^1216097280 is an apocalyptic number.

1216097280 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 1216097280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2279539200).

1216097280 is an abundant number, since it is smaller than the sum of its proper divisors (3342981120).

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

1216097280 is a wasteful number, since it uses less digits than its factorization.

1216097280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1216097280 is about 34872.5863680915. The cubic root of 1216097280 is about 1067.3891216807.

The spelling of 1216097280 in words is "one billion, two hundred sixteen million, ninety-seven thousand, two hundred eighty".