65920640 has 32 divisors (see below), whose sum is σ = 157593060. Its totient is φ = 26368000.

The previous prime is 65920639. The next prime is 65920651. The reversal of 65920640 is 4602956.

It can be written as a sum of positive squares in 2 ways, for example, as 58125376 + 7795264 = 7624^2 + 2792^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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

It is a junction number, because it is equal to n+sod(n) for n = 65920597 and 65920606.

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, 50861 + ... + 52140.

Almost surely, 2^65920640 is an apocalyptic number.

It is an amenable number.

65920640 is an abundant number, since it is smaller than the sum of its proper divisors (91672420).

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

65920640 is a wasteful number, since it uses less digits than its factorization.

65920640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103020 (or 103008 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 65920640 is about 8119.1526651492. The cubic root of 65920640 is about 403.9619609318.

The spelling of 65920640 in words is "sixty-five million, nine hundred twenty thousand, six hundred forty".