1216620000 has 300 divisors, whose sum is σ = 4477079376. Its totient is φ = 324000000.

The previous prime is 1216619981. The next prime is 1216620023. The reversal of 1216620000 is 266121.

It is a happy number.

1216620000 is a `hidden beast` number, since 1 + 2 + 1 + 662 + 0 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (300).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 49 ways as a sum of consecutive naturals, for example, 1619625 + ... + 1620375.

Almost surely, 2^1216620000 is an apocalyptic number.

1216620000 is a gapful number since it is divisible by the number (10) 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 1216620000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2238539688).

1216620000 is an abundant number, since it is smaller than the sum of its proper divisors (3260459376).

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

1216620000 is an frugal number, since it uses more digits than its factorization.

1216620000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1216620000 is about 34880.0802751370. The cubic root of 1216620000 is about 1067.5420331647.

Adding to 1216620000 its reverse (266121), we get a palindrome (1216886121).

The spelling of 1216620000 in words is "one billion, two hundred sixteen million, six hundred twenty thousand".