65521128 has 32 divisors (see below), whose sum is σ = 173439360. Its totient is φ = 20555520.

The previous prime is 65521123. The next prime is 65521153. The reversal of 65521128 is 82112556.

It is a junction number, because it is equal to n+sod(n) for n = 65521095 and 65521104.

It is not an unprimeable number, because it can be changed into a prime (65521123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79888 + ... + 80703.

It is an arithmetic number, because the mean of its divisors is an integer number (5419980).

Almost surely, 2^65521128 is an apocalyptic number.

65521128 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

65521128 is an abundant number, since it is smaller than the sum of its proper divisors (107918232).

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

65521128 is a wasteful number, since it uses less digits than its factorization.

65521128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160617 (or 160613 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 65521128 is about 8094.5122150751. The cubic root of 65521128 is about 403.1442363515.

The spelling of 65521128 in words is "sixty-five million, five hundred twenty-one thousand, one hundred twenty-eight".