1216071700 has 18 divisors (see below), whose sum is σ = 2638875806. Its totient is φ = 486428640.

The previous prime is 1216071683. The next prime is 1216071707. The reversal of 1216071700 is 71706121.

It can be written as a sum of positive squares in 3 ways, for example, as 10732176 + 1205339524 = 3276^2 + 34718^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216071707) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 6080259 + ... + 6080458.

Almost surely, 2^1216071700 is an apocalyptic number.

1216071700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216071700 is an abundant number, since it is smaller than the sum of its proper divisors (1422804106).

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

1216071700 is a wasteful number, since it uses less digits than its factorization.

1216071700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12160731 (or 12160724 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 1216071700 is about 34872.2196024285. The cubic root of 1216071700 is about 1067.3816376289.

Adding to 1216071700 its reverse (71706121), we get a palindrome (1287777821).

The spelling of 1216071700 in words is "one billion, two hundred sixteen million, seventy-one thousand, seven hundred".