65405585028 has 96 divisors (see below), whose sum is σ = 183828556800. Its totient is φ = 17681210496.

The previous prime is 65405585027. The next prime is 65405585041. The reversal of 65405585028 is 82058550456.

It is not an unprimeable number, because it can be changed into a prime (65405585023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1246303 + ... + 1297721.

It is an arithmetic number, because the mean of its divisors is an integer number (1914880800).

Almost surely, 2^65405585028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65405585028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91914278400).

65405585028 is an abundant number, since it is smaller than the sum of its proper divisors (118422971772).

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

65405585028 is a wasteful number, since it uses less digits than its factorization.

65405585028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52249 (or 52247 counting only the distinct ones).

The product of its (nonzero) digits is 1920000, while the sum is 48.

The spelling of 65405585028 in words is "sixty-five billion, four hundred five million, five hundred eighty-five thousand, twenty-eight".