65856390 has 64 divisors (see below), whose sum is σ = 166406400. Its totient is φ = 16655744.

The previous prime is 65856379. The next prime is 65856397. The reversal of 65856390 is 9365856.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65856397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50689 + ... + 51971.

It is an arithmetic number, because the mean of its divisors is an integer number (2600100).

Almost surely, 2^65856390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65856390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83203200).

65856390 is an abundant number, since it is smaller than the sum of its proper divisors (100550010).

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

65856390 is a wasteful number, since it uses less digits than its factorization.

65856390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 65856390 is about 8115.1950068991. The cubic root of 65856390 is about 403.8306768463.

The spelling of 65856390 in words is "sixty-five million, eight hundred fifty-six thousand, three hundred ninety".