1216737320 has 32 divisors (see below), whose sum is σ = 2804434920. Its totient is φ = 474823680.

The previous prime is 1216737317. The next prime is 1216737349. The reversal of 1216737320 is 237376121.

It can be written as a sum of positive squares in 4 ways, for example, as 399120484 + 817616836 = 19978^2 + 28594^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369317 + ... + 372596.

Almost surely, 2^1216737320 is an apocalyptic number.

1216737320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216737320 is an abundant number, since it is smaller than the sum of its proper divisors (1587697600).

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

1216737320 is a wasteful number, since it uses less digits than its factorization.

1216737320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741965 (or 741961 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 1216737320 is about 34881.7619967799. The cubic root of 1216737320 is about 1067.5763468112.

The spelling of 1216737320 in words is "one billion, two hundred sixteen million, seven hundred thirty-seven thousand, three hundred twenty".