1216628740 has 24 divisors (see below), whose sum is σ = 2570601600. Its totient is φ = 483664608.

The previous prime is 1216628737. The next prime is 1216628741. The reversal of 1216628740 is 478266121.

It is a self number, because there is not a number n which added to its sum of digits gives 1216628740.

It is not an unprimeable number, because it can be changed into a prime (1216628741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183340 + ... + 189859.

It is an arithmetic number, because the mean of its divisors is an integer number (107108400).

Almost surely, 2^1216628740 is an apocalyptic number.

1216628740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216628740 is an abundant number, since it is smaller than the sum of its proper divisors (1353972860).

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

1216628740 is a wasteful number, since it uses less digits than its factorization.

1216628740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373371 (or 373369 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 1216628740 is about 34880.2055613209. The cubic root of 1216628740 is about 1067.5445895080.

The spelling of 1216628740 in words is "one billion, two hundred sixteen million, six hundred twenty-eight thousand, seven hundred forty".