1620381888 has 56 divisors (see below), whose sum is σ = 4763627760. Its totient is φ = 540126720.

The previous prime is 1620381887. The next prime is 1620381913. The reversal of 1620381888 is 8881830261.

1620381888 is a `hidden beast` number, since 1 + 620 + 3 + 8 + 18 + 8 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1620381881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467133 + ... + 470588.

Almost surely, 2^1620381888 is an apocalyptic number.

1620381888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1620381888 is an abundant number, since it is smaller than the sum of its proper divisors (3143245872).

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

1620381888 is an equidigital number, since it uses as much as digits as its factorization.

1620381888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937742 (or 937726 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The square root of 1620381888 is about 40253.9673572680. The cubic root of 1620381888 is about 1174.5525715798.

The spelling of 1620381888 in words is "one billion, six hundred twenty million, three hundred eighty-one thousand, eight hundred eighty-eight".