66398 has 4 divisors (see below), whose sum is σ = 99600. Its totient is φ = 33198.
The previous prime is 66383. The next prime is 66403. The reversal of 66398 is 89366.
It is a happy number.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89366 = 2 ⋅44683.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 66398.
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16598 + ... + 16601.
It is an arithmetic number, because the mean of its divisors is an integer number (24900).
266398 is an apocalyptic number.
66398 is a deficient number, since it is larger than the sum of its proper divisors (33202).
66398 is a wasteful number, since it uses less digits than its factorization.
66398 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 33201.
The product of its digits is 7776, while the sum is 32.
The square root of 66398 is about 257.6780937527. The cubic root of 66398 is about 40.4934704710.
Adding to 66398 its sum of digits (32), we get a triangular number (66430 = T364).
Subtracting from 66398 its sum of digits (32), we obtain a palindrome (66366).
It can be divided in two parts, 66 and 398, that added together give a palindrome (464).
The spelling of 66398 in words is "sixty-six thousand, three hundred ninety-eight".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.070 sec. • engine limits •