65644379 has 4 divisors (see below), whose sum is σ = 65705640. Its totient is φ = 65583120.

The previous prime is 65644351. The next prime is 65644387. The reversal of 65644379 is 97344656.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65644379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65644349) 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, 28994 + ... + 31175.

It is an arithmetic number, because the mean of its divisors is an integer number (16426410).

Almost surely, 2^65644379 is an apocalyptic number.

65644379 is a deficient number, since it is larger than the sum of its proper divisors (61261).

65644379 is a wasteful number, since it uses less digits than its factorization.

65644379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61260.

The product of its digits is 544320, while the sum is 44.

The square root of 65644379 is about 8102.1218825688. The cubic root of 65644379 is about 403.3968612605.

The spelling of 65644379 in words is "sixty-five million, six hundred forty-four thousand, three hundred seventy-nine".