65216385 has 96 divisors (see below), whose sum is σ = 131459328. Its totient is φ = 29652480.

The previous prime is 65216357. The next prime is 65216399. The reversal of 65216385 is 58361256.

65216385 is a `hidden beast` number, since 65 + 216 + 385 = 666.

It is not a de Polignac number, because 65216385 - 2⁵ = 65216353 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 497770 + ... + 497900.

It is an arithmetic number, because the mean of its divisors is an integer number (1369368).

Almost surely, 2^65216385 is an apocalyptic number.

65216385 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65216385 is an abundant number, since it is smaller than the sum of its proper divisors (66242943).

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

65216385 is a wasteful number, since it uses less digits than its factorization.

65216385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 212 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 65216385 is about 8075.6662263865. Note that the first 3 decimals coincide. The cubic root of 65216385 is about 402.5182482114.

The spelling of 65216385 in words is "sixty-five million, two hundred sixteen thousand, three hundred eighty-five".