65865920 has 56 divisors (see below), whose sum is σ = 161111184. Its totient is φ = 25629696.

The previous prime is 65865887. The next prime is 65865923. The reversal of 65865920 is 2956856.

It is not an unprimeable number, because it can be changed into a prime (65865923) by changing a digit.

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, 9059 + ... + 14621.

Almost surely, 2^65865920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65865920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80555592).

65865920 is an abundant number, since it is smaller than the sum of its proper divisors (95245264).

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

65865920 is a wasteful number, since it uses less digits than its factorization.

65865920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5617 (or 5607 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 65865920 is about 8115.7821557753. The cubic root of 65865920 is about 403.8501551926.

The spelling of 65865920 in words is "sixty-five million, eight hundred sixty-five thousand, nine hundred twenty".