1620609120 has 240 divisors, whose sum is σ = 6159993840. Its totient is φ = 398877696.

The previous prime is 1620609119. The next prime is 1620609163. The reversal of 1620609120 is 219060261.

1620609120 is a `hidden beast` number, since 16 + 20 + 609 + 1 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 163671 + ... + 173289.

It is an arithmetic number, because the mean of its divisors is an integer number (25666641).

Almost surely, 2^1620609120 is an apocalyptic number.

1620609120 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 1620609120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3079996920).

1620609120 is an abundant number, since it is smaller than the sum of its proper divisors (4539384720).

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

1620609120 is a wasteful number, since it uses less digits than its factorization.

1620609120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9659 (or 9642 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1620609120 is about 40256.7897378815. The cubic root of 1620609120 is about 1174.6074729289.

Adding to 1620609120 its reverse (219060261), we get a palindrome (1839669381).

The spelling of 1620609120 in words is "one billion, six hundred twenty million, six hundred nine thousand, one hundred twenty".