65720928 has 96 divisors (see below), whose sum is σ = 212357376. Its totient is φ = 17330688.

The previous prime is 65720927. The next prime is 65720933. The reversal of 65720928 is 82902756.

It is a happy number.

65720928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65720927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4975 + ... + 12497.

It is an arithmetic number, because the mean of its divisors is an integer number (2212056).

Almost surely, 2^65720928 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 65720928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106178688).

65720928 is an abundant number, since it is smaller than the sum of its proper divisors (146636448).

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

65720928 is a wasteful number, since it uses less digits than its factorization.

65720928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7556 (or 7548 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 65720928 is about 8106.8445155930. The cubic root of 65720928 is about 403.5536029419.

The spelling of 65720928 in words is "sixty-five million, seven hundred twenty thousand, nine hundred twenty-eight".