65969728 has 56 divisors (see below), whose sum is σ = 144658080. Its totient is φ = 29598720.

The previous prime is 65969723. The next prime is 65969753. The reversal of 65969728 is 82796956.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65969723) 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, 57868 + ... + 58996.

It is an arithmetic number, because the mean of its divisors is an integer number (2583180).

Almost surely, 2^65969728 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 65969728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72329040).

65969728 is an abundant number, since it is smaller than the sum of its proper divisors (78688352).

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

65969728 is a wasteful number, since it uses less digits than its factorization.

65969728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235 (or 1225 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 52.

The square root of 65969728 is about 8122.1750781426. The cubic root of 65969728 is about 404.0622065438.

The spelling of 65969728 in words is "sixty-five million, nine hundred sixty-nine thousand, seven hundred twenty-eight".