65879809 has 4 divisors (see below), whose sum is σ = 65941504. Its totient is φ = 65818116.

The previous prime is 65879773. The next prime is 65879819. The reversal of 65879809 is 90897856.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65879809 - 2¹¹ = 65877761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65879819) 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, 29217 + ... + 31390.

It is an arithmetic number, because the mean of its divisors is an integer number (16485376).

Almost surely, 2^65879809 is an apocalyptic number.

It is an amenable number.

65879809 is a deficient number, since it is larger than the sum of its proper divisors (61695).

65879809 is a wasteful number, since it uses less digits than its factorization.

65879809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61694.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 65879809 is about 8116.6377891341. The cubic root of 65879809 is about 403.8785395255.

The spelling of 65879809 in words is "sixty-five million, eight hundred seventy-nine thousand, eight hundred nine".