65439879 has 4 divisors (see below), whose sum is σ = 87253176. Its totient is φ = 43626584.

The previous prime is 65439877. The next prime is 65439889. The reversal of 65439879 is 97893456.

65439879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 65439879 - 2¹ = 65439877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65439877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10906644 + ... + 10906649.

It is an arithmetic number, because the mean of its divisors is an integer number (21813294).

Almost surely, 2^65439879 is an apocalyptic number.

65439879 is a deficient number, since it is larger than the sum of its proper divisors (21813297).

65439879 is a wasteful number, since it uses less digits than its factorization.

65439879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21813296.

The product of its digits is 1632960, while the sum is 51.

The square root of 65439879 is about 8089.4918876280. The cubic root of 65439879 is about 402.9775287279.

The spelling of 65439879 in words is "sixty-five million, four hundred thirty-nine thousand, eight hundred seventy-nine".