1216335460 has 24 divisors (see below), whose sum is σ = 2555474040. Its totient is φ = 486311424.

The previous prime is 1216335409. The next prime is 1216335517. The reversal of 1216335460 is 645336121.

It can be written as a sum of positive squares in 4 ways, for example, as 23600164 + 1192735296 = 4858^2 + 34536^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35052 + ... + 60508.

It is an arithmetic number, because the mean of its divisors is an integer number (106478085).

Almost surely, 2^1216335460 is an apocalyptic number.

1216335460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216335460 is an abundant number, since it is smaller than the sum of its proper divisors (1339138580).

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

1216335460 is a wasteful number, since it uses less digits than its factorization.

1216335460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27855 (or 27853 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1216335460 is about 34876.0012042665. The cubic root of 1216335460 is about 1067.4588020014.

The spelling of 1216335460 in words is "one billion, two hundred sixteen million, three hundred thirty-five thousand, four hundred sixty".