64858819 has 4 divisors (see below), whose sum is σ = 67095360. Its totient is φ = 62622280.

The previous prime is 64858813. The next prime is 64858823. The reversal of 64858819 is 91885846.

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 64858819 - 2⁷ = 64858691 is a prime.

It is a super-2 number, since 2×64858819² = 8413332804149522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64858813) 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, 1118227 + ... + 1118284.

It is an arithmetic number, because the mean of its divisors is an integer number (16773840).

Almost surely, 2^64858819 is an apocalyptic number.

64858819 is a deficient number, since it is larger than the sum of its proper divisors (2236541).

64858819 is a wasteful number, since it uses less digits than its factorization.

64858819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236540.

The product of its digits is 552960, while the sum is 49.

The square root of 64858819 is about 8053.4973148316. The cubic root of 64858819 is about 401.7812622376.

The spelling of 64858819 in words is "sixty-four million, eight hundred fifty-eight thousand, eight hundred nineteen".