65387728 has 40 divisors (see below), whose sum is σ = 145958912. Its totient is φ = 27796608.

The previous prime is 65387723. The next prime is 65387731. The reversal of 65387728 is 82778356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65387723) 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, 11926 + ... + 16522.

Almost surely, 2^65387728 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 65387728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72979456).

65387728 is an abundant number, since it is smaller than the sum of its proper divisors (80571184).

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

65387728 is a wasteful number, since it uses less digits than its factorization.

65387728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4739 (or 4733 counting only the distinct ones).

The product of its digits is 564480, while the sum is 46.

The square root of 65387728 is about 8086.2678659565. The cubic root of 65387728 is about 402.8704519904.

The spelling of 65387728 in words is "sixty-five million, three hundred eighty-seven thousand, seven hundred twenty-eight".