64478443 has 4 divisors (see below), whose sum is σ = 64767808. Its totient is φ = 64189080.

The previous prime is 64478431. The next prime is 64478461. The reversal of 64478443 is 34487446.

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 64478443 - 2⁵ = 64478411 is a prime.

It is a super-2 number, since 2×64478443² = 8314939223408498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64478396 and 64478405.

It is not an unprimeable number, because it can be changed into a prime (64478413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144348 + ... + 144793.

It is an arithmetic number, because the mean of its divisors is an integer number (16191952).

Almost surely, 2^64478443 is an apocalyptic number.

64478443 is a deficient number, since it is larger than the sum of its proper divisors (289365).

64478443 is a wasteful number, since it uses less digits than its factorization.

64478443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289364.

The product of its digits is 258048, while the sum is 40.

The square root of 64478443 is about 8029.8470097506. The cubic root of 64478443 is about 400.9942827069.

The spelling of 64478443 in words is "sixty-four million, four hundred seventy-eight thousand, four hundred forty-three".