1620382320 has 480 divisors, whose sum is σ = 6142106880. Its totient is φ = 395642880.

The previous prime is 1620382271. The next prime is 1620382321. The reversal of 1620382320 is 232830261.

1620382320 is a `hidden beast` number, since 1 + 620 + 3 + 8 + 2 + 32 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620382321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15143707 + ... + 15143813.

It is an arithmetic number, because the mean of its divisors is an integer number (12796056).

Almost surely, 2^1620382320 is an apocalyptic number.

1620382320 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 1620382320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3071053440).

1620382320 is an abundant number, since it is smaller than the sum of its proper divisors (4521724560).

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

1620382320 is a wasteful number, since it uses less digits than its factorization.

1620382320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1620382320 is about 40253.9727231984. The cubic root of 1620382320 is about 1174.5526759599.

The spelling of 1620382320 in words is "one billion, six hundred twenty million, three hundred eighty-two thousand, three hundred twenty".