64894819 has 4 divisors (see below), whose sum is σ = 70794360. Its totient is φ = 58995280.

The previous prime is 64894777. The next prime is 64894829. The reversal of 64894819 is 91849846.

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 64894819 - 2⁷ = 64894691 is a prime.

It is a super-2 number, since 2×64894819² = 8422675066085522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64894829) 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, 2949754 + ... + 2949775.

It is an arithmetic number, because the mean of its divisors is an integer number (17698590).

Almost surely, 2^64894819 is an apocalyptic number.

64894819 is a deficient number, since it is larger than the sum of its proper divisors (5899541).

64894819 is a wasteful number, since it uses less digits than its factorization.

64894819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5899540.

The product of its digits is 497664, while the sum is 49.

The square root of 64894819 is about 8055.7320586027. The cubic root of 64894819 is about 401.8555849505.

The spelling of 64894819 in words is "sixty-four million, eight hundred ninety-four thousand, eight hundred nineteen".