65515128 has 32 divisors (see below), whose sum is σ = 187186560. Its totient is φ = 18718560.

The previous prime is 65515117. The next prime is 65515129. The reversal of 65515128 is 82151556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65515129) 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 7 ways as a sum of consecutive naturals, for example, 194818 + ... + 195153.

It is an arithmetic number, because the mean of its divisors is an integer number (5849580).

Almost surely, 2^65515128 is an apocalyptic number.

It is an amenable number.

65515128 is an abundant number, since it is smaller than the sum of its proper divisors (121671432).

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

65515128 is a wasteful number, since it uses less digits than its factorization.

65515128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389987 (or 389983 counting only the distinct ones).

The product of its digits is 12000, while the sum is 33.

The square root of 65515128 is about 8094.1415851219. The cubic root of 65515128 is about 403.1319301975.

The spelling of 65515128 in words is "sixty-five million, five hundred fifteen thousand, one hundred twenty-eight".