65721152 has 84 divisors (see below), whose sum is σ = 159837120. Its totient is φ = 26659584.

The previous prime is 65721121. The next prime is 65721169. The reversal of 65721152 is 25112756.

65721152 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 59033 + ... + 60135.

Almost surely, 2^65721152 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 65721152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79918560).

65721152 is an abundant number, since it is smaller than the sum of its proper divisors (94115968).

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

65721152 is a wasteful number, since it uses less digits than its factorization.

65721152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148 (or 1131 counting only the distinct ones).

The product of its digits is 4200, while the sum is 29.

The square root of 65721152 is about 8106.8583310676. The cubic root of 65721152 is about 403.5540614255.

The spelling of 65721152 in words is "sixty-five million, seven hundred twenty-one thousand, one hundred fifty-two".