65569920 has 256 divisors, whose sum is σ = 234420480. Its totient is φ = 15482880.

The previous prime is 65569919. The next prime is 65569939. The reversal of 65569920 is 2996556.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 923485 + ... + 923555.

It is an arithmetic number, because the mean of its divisors is an integer number (915705).

Almost surely, 2^65569920 is an apocalyptic number.

65569920 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 65569920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117210240).

65569920 is an abundant number, since it is smaller than the sum of its proper divisors (168850560).

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

65569920 is a wasteful number, since it uses less digits than its factorization.

65569920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 65569920 is about 8097.5255479683. The cubic root of 65569920 is about 403.2442821105.

The spelling of 65569920 in words is "sixty-five million, five hundred sixty-nine thousand, nine hundred twenty".