1212636672 has 240 divisors, whose sum is σ = 3896500608. Its totient is φ = 360529920.

The previous prime is 1212636647. The next prime is 1212636709. The reversal of 1212636672 is 2766362121.

1212636672 is a `hidden beast` number, since 1 + 2 + 12 + 636 + 6 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 1856698 + ... + 1857350.

Almost surely, 2^1212636672 is an apocalyptic number.

1212636672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212636672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1948250304).

1212636672 is an abundant number, since it is smaller than the sum of its proper divisors (2683863936).

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

1212636672 is a wasteful number, since it uses less digits than its factorization.

1212636672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721 (or 702 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 1212636672 is about 34822.9331332098. The cubic root of 1212636672 is about 1066.3756817381.

Adding to 1212636672 its reverse (2766362121), we get a palindrome (3978998793).

The spelling of 1212636672 in words is "one billion, two hundred twelve million, six hundred thirty-six thousand, six hundred seventy-two".