1620988992 has 252 divisors, whose sum is σ = 5480791680. Its totient is φ = 456648192.

The previous prime is 1620988987. The next prime is 1620989021. The reversal of 1620988992 is 2998890261.

1620988992 is a `hidden beast` number, since 1 + 620 + 9 + 8 + 8 + 9 + 9 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (252).

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 2229333 + ... + 2230059.

Almost surely, 2^1620988992 is an apocalyptic number.

1620988992 is a gapful number since it is divisible by the number (12) 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 1620988992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2740395840).

1620988992 is an abundant number, since it is smaller than the sum of its proper divisors (3859802688).

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

1620988992 is a wasteful number, since it uses less digits than its factorization.

1620988992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 1620988992 is about 40261.5075723699. The cubic root of 1620988992 is about 1174.6992420515.

The spelling of 1620988992 in words is "one billion, six hundred twenty million, nine hundred eighty-eight thousand, nine hundred ninety-two".