65720448 has 96 divisors (see below), whose sum is σ = 191540700. Its totient is φ = 21626880.

The previous prime is 65720441. The next prime is 65720509. The reversal of 65720448 is 84402756.

It can be written as a sum of positive squares in 2 ways, for example, as 65415744 + 304704 = 8088^2 + 552^2 .

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 (36).

It is not an unprimeable number, because it can be changed into a prime (65720441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102208 + ... + 102848.

Almost surely, 2^65720448 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 65720448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95770350).

65720448 is an abundant number, since it is smaller than the sum of its proper divisors (125820252).

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

65720448 is a wasteful number, since it uses less digits than its factorization.

65720448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 735 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 65720448 is about 8106.8149109253. The cubic root of 65720448 is about 403.5526204735.

It can be divided in two parts, 657 and 20448, that multiplied together give a triangular number (13434336 = T₅₁₈₃).

The spelling of 65720448 in words is "sixty-five million, seven hundred twenty thousand, four hundred forty-eight".