1620773568 has 336 divisors, whose sum is σ = 5249387520. Its totient is φ = 475656192.

The previous prime is 1620773503. The next prime is 1620773573. The reversal of 1620773568 is 8653770261.

1620773568 is a `hidden beast` number, since 16 + 2 + 0 + 7 + 73 + 568 = 666.

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 47 ways as a sum of consecutive naturals, for example, 11830396 + ... + 11830532.

Almost surely, 2^1620773568 is an apocalyptic number.

1620773568 is a gapful number since it is divisible by the number (18) 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 1620773568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2624693760).

1620773568 is an abundant number, since it is smaller than the sum of its proper divisors (3628613952).

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

1620773568 is a wasteful number, since it uses less digits than its factorization.

1620773568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 1620773568 is about 40258.8321738224. The cubic root of 1620773568 is about 1174.6472018831.

The spelling of 1620773568 in words is "one billion, six hundred twenty million, seven hundred seventy-three thousand, five hundred sixty-eight".