1213664100 has 72 divisors (see below), whose sum is σ = 3830775648. Its totient is φ = 294220800.

The previous prime is 1213664099. The next prime is 1213664117. The reversal of 1213664100 is 14663121.

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 23 ways as a sum of consecutive naturals, for example, 180589 + ... + 187188.

Almost surely, 2^1213664100 is an apocalyptic number.

1213664100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213664100 is an abundant number, since it is smaller than the sum of its proper divisors (2617111548).

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

1213664100 is a wasteful number, since it uses less digits than its factorization.

1213664100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367805 (or 367798 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1213664100 is about 34837.6821846689. The cubic root of 1213664100 is about 1066.6767653124.

The spelling of 1213664100 in words is "one billion, two hundred thirteen million, six hundred sixty-four thousand, one hundred".