65816720 has 40 divisors (see below), whose sum is σ = 157966080. Its totient is φ = 25476480.

The previous prime is 65816719. The next prime is 65816749. The reversal of 65816720 is 2761856.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10790 + ... + 15749.

It is an arithmetic number, because the mean of its divisors is an integer number (3949152).

Almost surely, 2^65816720 is an apocalyptic number.

It is an amenable number.

65816720 is an abundant number, since it is smaller than the sum of its proper divisors (92149360).

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

65816720 is a wasteful number, since it uses less digits than its factorization.

65816720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26583 (or 26577 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 65816720 is about 8112.7504583834. The cubic root of 65816720 is about 403.7495752215.

The spelling of 65816720 in words is "sixty-five million, eight hundred sixteen thousand, seven hundred twenty".