65559920 has 20 divisors (see below), whose sum is σ = 152427000. Its totient is φ = 26223936.

The previous prime is 65559919. The next prime is 65559931. The reversal of 65559920 is 2995556.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×65559920² = 8596206220812800, which contains 22 as substring.

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, 409670 + ... + 409829.

It is an arithmetic number, because the mean of its divisors is an integer number (7621350).

Almost surely, 2^65559920 is an apocalyptic number.

It is an amenable number.

65559920 is an abundant number, since it is smaller than the sum of its proper divisors (86867080).

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

65559920 is a wasteful number, since it uses less digits than its factorization.

65559920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819512 (or 819506 counting only the distinct ones).

The product of its (nonzero) digits is 121500, while the sum is 41.

The square root of 65559920 is about 8096.9080518430. The cubic root of 65559920 is about 403.2237816136.

The spelling of 65559920 in words is "sixty-five million, five hundred fifty-nine thousand, nine hundred twenty".