65664320 has 28 divisors (see below), whose sum is σ = 156363924. Its totient is φ = 26265600.

The previous prime is 65664317. The next prime is 65664337. The reversal of 65664320 is 2346656.

It can be written as a sum of positive squares in 2 ways, for example, as 44943616 + 20720704 = 6704^2 + 4552^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102281 + ... + 102920.

Almost surely, 2^65664320 is an apocalyptic number.

It is an amenable number.

65664320 is an abundant number, since it is smaller than the sum of its proper divisors (90699604).

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

65664320 is a wasteful number, since it uses less digits than its factorization.

65664320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205218 (or 205208 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 65664320 is about 8103.3523926829. The cubic root of 65664320 is about 403.4377041706.

The spelling of 65664320 in words is "sixty-five million, six hundred sixty-four thousand, three hundred twenty".