1216928200 has 24 divisors (see below), whose sum is σ = 2829358530. Its totient is φ = 486771200.

The previous prime is 1216928179. The next prime is 1216928201. The reversal of 1216928200 is 28296121.

It can be written as a sum of positive squares in 3 ways, for example, as 692426596 + 524501604 = 26314^2 + 22902^2 .

It is not an unprimeable number, because it can be changed into a prime (1216928201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3042121 + ... + 3042520.

Almost surely, 2^1216928200 is an apocalyptic number.

1216928200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216928200 is an abundant number, since it is smaller than the sum of its proper divisors (1612430330).

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

1216928200 is a wasteful number, since it uses less digits than its factorization.

1216928200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6084657 (or 6084648 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1216928200 is about 34884.4979897948. The cubic root of 1216928200 is about 1067.6321705059.

The spelling of 1216928200 in words is "one billion, two hundred sixteen million, nine hundred twenty-eight thousand, two hundred".