65439679 has 4 divisors (see below), whose sum is σ = 66961576. Its totient is φ = 63917784.

The previous prime is 65439677. The next prime is 65439691. The reversal of 65439679 is 97693456.

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 65439679 - 2¹ = 65439677 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 (65439677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 760884 + ... + 760969.

It is an arithmetic number, because the mean of its divisors is an integer number (16740394).

Almost surely, 2^65439679 is an apocalyptic number.

65439679 is a deficient number, since it is larger than the sum of its proper divisors (1521897).

65439679 is a wasteful number, since it uses less digits than its factorization.

65439679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521896.

The product of its digits is 1224720, while the sum is 49.

The square root of 65439679 is about 8089.4795259028. The cubic root of 65439679 is about 402.9771181954.

The spelling of 65439679 in words is "sixty-five million, four hundred thirty-nine thousand, six hundred seventy-nine".