65021680 has 40 divisors (see below), whose sum is σ = 154400832. Its totient is φ = 25453824.

The previous prime is 65021647. The next prime is 65021689. The reversal of 65021680 is 8612056.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65021689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4887 + ... + 12406.

Almost surely, 2^65021680 is an apocalyptic number.

It is an amenable number.

65021680 is an abundant number, since it is smaller than the sum of its proper divisors (89379152).

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

65021680 is a wasteful number, since it uses less digits than its factorization.

65021680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17353 (or 17347 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 65021680 is about 8063.6021727265. The cubic root of 65021680 is about 402.1172731126.

The spelling of 65021680 in words is "sixty-five million, twenty-one thousand, six hundred eighty".