64446819 has 4 divisors (see below), whose sum is σ = 85929096. Its totient is φ = 42964544.

The previous prime is 64446817. The next prime is 64446827. The reversal of 64446819 is 91864446.

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 64446819 - 2¹ = 64446817 is a prime.

It is a super-2 number, since 2×64446819² = 8306784958437522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64446817) 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, 10741134 + ... + 10741139.

It is an arithmetic number, because the mean of its divisors is an integer number (21482274).

Almost surely, 2^64446819 is an apocalyptic number.

64446819 is a deficient number, since it is larger than the sum of its proper divisors (21482277).

64446819 is a wasteful number, since it uses less digits than its factorization.

64446819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21482276.

The product of its digits is 165888, while the sum is 42.

The square root of 64446819 is about 8027.8776149117. The cubic root of 64446819 is about 400.9287149691.

The spelling of 64446819 in words is "sixty-four million, four hundred forty-six thousand, eight hundred nineteen".