1621613120 has 56 divisors (see below), whose sum is σ = 3878503800. Its totient is φ = 645783552.

The previous prime is 1621613101. The next prime is 1621613173. The reversal of 1621613120 is 213161261.

It can be written as a sum of positive squares in 4 ways, for example, as 953080384 + 668532736 = 30872^2 + 25856^2 .

It is a super-2 number, since 2×1621613120² = 5259258221912268800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62216 + ... + 84344.

Almost surely, 2^1621613120 is an apocalyptic number.

1621613120 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 1621613120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1939251900).

1621613120 is an abundant number, since it is smaller than the sum of its proper divisors (2256890680).

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

1621613120 is a wasteful number, since it uses less digits than its factorization.

1621613120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22375 (or 22365 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1621613120 is about 40269.2577532787. The cubic root of 1621613120 is about 1174.8499871863.

Adding to 1621613120 its reverse (213161261), we get a palindrome (1834774381).

The spelling of 1621613120 in words is "one billion, six hundred twenty-one million, six hundred thirteen thousand, one hundred twenty".