1620465568 has 24 divisors (see below), whose sum is σ = 3377956932. Its totient is φ = 762571776.

The previous prime is 1620465563. The next prime is 1620465571. The reversal of 1620465568 is 8655640261.

It can be written as a sum of positive squares in 2 ways, for example, as 1620223504 + 242064 = 40252^2 + 492^2 .

It is not an unprimeable number, because it can be changed into a prime (1620465563) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1488855 + ... + 1489942.

Almost surely, 2^1620465568 is an apocalyptic number.

It is an amenable number.

1620465568 is an abundant number, since it is smaller than the sum of its proper divisors (1757491364).

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

1620465568 is a wasteful number, since it uses less digits than its factorization.

1620465568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2978824 (or 2978816 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 1620465568 is about 40255.0067445032. The cubic root of 1620465568 is about 1174.5727900374.

The spelling of 1620465568 in words is "one billion, six hundred twenty million, four hundred sixty-five thousand, five hundred sixty-eight".