65656320 has 160 divisors (see below), whose sum is σ = 214486272. Its totient is φ = 17129472.

The previous prime is 65656309. The next prime is 65656351. The reversal of 65656320 is 2365656.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637389 + ... + 637491.

Almost surely, 2^65656320 is an apocalyptic number.

65656320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65656320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107243136).

65656320 is an abundant number, since it is smaller than the sum of its proper divisors (148829952).

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

65656320 is a wasteful number, since it uses less digits than its factorization.

65656320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 65656320 is about 8102.8587547853. The cubic root of 65656320 is about 403.4213196627.

The spelling of 65656320 in words is "sixty-five million, six hundred fifty-six thousand, three hundred twenty".