65898391 has 4 divisors (see below), whose sum is σ = 70967512. Its totient is φ = 60829272.

The previous prime is 65898389. The next prime is 65898397. The reversal of 65898391 is 19389856.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65898391 - 2¹ = 65898389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65898397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2534541 + ... + 2534566.

It is an arithmetic number, because the mean of its divisors is an integer number (17741878).

Almost surely, 2^65898391 is an apocalyptic number.

65898391 is a deficient number, since it is larger than the sum of its proper divisors (5069121).

65898391 is a wasteful number, since it uses less digits than its factorization.

65898391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5069120.

The product of its digits is 466560, while the sum is 49.

The square root of 65898391 is about 8117.7823942257. The cubic root of 65898391 is about 403.9165084958.

The spelling of 65898391 in words is "sixty-five million, eight hundred ninety-eight thousand, three hundred ninety-one".