1216010720 has 24 divisors (see below), whose sum is σ = 2872825704. Its totient is φ = 486404224.

The previous prime is 1216010707. The next prime is 1216010771. The reversal of 1216010720 is 270106121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1216010692 and 1216010701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3799874 + ... + 3800193.

It is an arithmetic number, because the mean of its divisors is an integer number (119701071).

Almost surely, 2^1216010720 is an apocalyptic number.

1216010720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216010720 is an abundant number, since it is smaller than the sum of its proper divisors (1656814984).

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

1216010720 is an equidigital number, since it uses as much as digits as its factorization.

1216010720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7600082 (or 7600074 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 1216010720 is about 34871.3452565283. The cubic root of 1216010720 is about 1067.3637960218.

Adding to 1216010720 its reverse (270106121), we get a palindrome (1486116841).

The spelling of 1216010720 in words is "one billion, two hundred sixteen million, ten thousand, seven hundred twenty".