1620803805120 has 280 divisors, whose sum is σ = 5818388769600. Its totient is φ = 428248332288.

The previous prime is 1620803805053. The next prime is 1620803805199. The reversal of 1620803805120 is 215083080261.

It is a happy number.

1620803805120 is a `hidden beast` number, since 1 + 6 + 208 + 0 + 380 + 51 + 20 = 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 polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2538441 + ... + 3112119.

Almost surely, 2^{1620803805120} is an apocalyptic number.

1620803805120 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 1620803805120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2909194384800).

1620803805120 is an abundant number, since it is smaller than the sum of its proper divisors (4197584964480).

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

1620803805120 is a wasteful number, since it uses less digits than its factorization.

1620803805120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573817 (or 573798 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

Adding to 1620803805120 its reverse (215083080261), we get a palindrome (1835886885381).

The spelling of 1620803805120 in words is "one trillion, six hundred twenty billion, eight hundred three million, eight hundred five thousand, one hundred twenty".