1216690500 has 48 divisors (see below), whose sum is σ = 3543007104. Its totient is φ = 324450400.

The previous prime is 1216690483. The next prime is 1216690513. The reversal of 1216690500 is 50966121.

It is a super-3 number, since 3×1216690500³ (a number of 28 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 15 ways as a sum of consecutive naturals, for example, 404064 + ... + 407063.

It is an arithmetic number, because the mean of its divisors is an integer number (73812648).

Almost surely, 2^1216690500 is an apocalyptic number.

1216690500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216690500 is an abundant number, since it is smaller than the sum of its proper divisors (2326316604).

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

1216690500 is a wasteful number, since it uses less digits than its factorization.

1216690500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811149 (or 811137 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1216690500 is about 34881.0908659692. The cubic root of 1216690500 is about 1067.5626532049.

The spelling of 1216690500 in words is "one billion, two hundred sixteen million, six hundred ninety thousand, five hundred".