64816879 has 4 divisors (see below), whose sum is σ = 65124280. Its totient is φ = 64509480.

The previous prime is 64816861. The next prime is 64816891. The reversal of 64816879 is 97861846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97861846 = 2 ⋅48930923.

It is a cyclic number.

It is not a de Polignac number, because 64816879 - 2¹⁷ = 64685807 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 (64816819) 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, 153384 + ... + 153805.

It is an arithmetic number, because the mean of its divisors is an integer number (16281070).

Almost surely, 2^64816879 is an apocalyptic number.

64816879 is a deficient number, since it is larger than the sum of its proper divisors (307401).

64816879 is a wasteful number, since it uses less digits than its factorization.

64816879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307400.

The product of its digits is 580608, while the sum is 49.

The square root of 64816879 is about 8050.8930560529. The cubic root of 64816879 is about 401.6946415858.

The spelling of 64816879 in words is "sixty-four million, eight hundred sixteen thousand, eight hundred seventy-nine".