865735728 has 80 divisors (see below), whose sum is σ = 2627498496. Its totient is φ = 242161920.

The previous prime is 865735721. The next prime is 865735757. The reversal of 865735728 is 827537568.

It is not an unprimeable number, because it can be changed into a prime (865735721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56200 + ... + 69927.

Almost surely, 2^865735728 is an apocalyptic number.

865735728 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

865735728 is an abundant number, since it is smaller than the sum of its proper divisors (1761762768).

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

865735728 is a wasteful number, since it uses less digits than its factorization.

865735728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126162 (or 126156 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 51.

The square root of 865735728 is about 29423.3874324490. The cubic root of 865735728 is about 953.0780046602.

The spelling of 865735728 in words is "eight hundred sixty-five million, seven hundred thirty-five thousand, seven hundred twenty-eight".