1216440280 has 32 divisors (see below), whose sum is σ = 2985809040. Its totient is φ = 442341760.

The previous prime is 1216440271. The next prime is 1216440301. The reversal of 1216440280 is 820446121.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1381879 + ... + 1382758.

Almost surely, 2^1216440280 is an apocalyptic number.

1216440280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216440280 is an abundant number, since it is smaller than the sum of its proper divisors (1769368760).

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

1216440280 is a wasteful number, since it uses less digits than its factorization.

1216440280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2764659 (or 2764655 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 1216440280 is about 34877.5039244496. The cubic root of 1216440280 is about 1067.4894645451.

The spelling of 1216440280 in words is "one billion, two hundred sixteen million, four hundred forty thousand, two hundred eighty".