1996643520 has 280 divisors, whose sum is σ = 7154137584. Its totient is φ = 530758656.

The previous prime is 1996643503. The next prime is 1996643531. The reversal of 1996643520 is 253466991.

1996643520 is a `hidden beast` number, since 199 + 6 + 6 + 435 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 39 ways as a sum of consecutive naturals, for example, 6298402 + ... + 6298718.

Almost surely, 2^1996643520 is an apocalyptic number.

1996643520 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 1996643520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3577068792).

1996643520 is an abundant number, since it is smaller than the sum of its proper divisors (5157494064).

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

1996643520 is an frugal number, since it uses more digits than its factorization.

1996643520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 1996643520 is about 44683.8172048897. The cubic root of 1996643520 is about 1259.2158386088.

The spelling of 1996643520 in words is "one billion, nine hundred ninety-six million, six hundred forty-three thousand, five hundred twenty".