64478845 has 4 divisors (see below), whose sum is σ = 77374620. Its totient is φ = 51583072.

The previous prime is 64478839. The next prime is 64478849. The reversal of 64478845 is 54887446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30769209 + 33709636 = 5547^2 + 5806^2 .

It is a cyclic number.

It is not a de Polignac number, because 64478845 - 2⁷ = 64478717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64478795 and 64478804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64478849) 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, 6447880 + ... + 6447889.

It is an arithmetic number, because the mean of its divisors is an integer number (19343655).

Almost surely, 2^64478845 is an apocalyptic number.

It is an amenable number.

64478845 is a deficient number, since it is larger than the sum of its proper divisors (12895775).

64478845 is a wasteful number, since it uses less digits than its factorization.

64478845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12895774.

The product of its digits is 860160, while the sum is 46.

The square root of 64478845 is about 8029.8720413217. The cubic root of 64478845 is about 400.9951160571.

The spelling of 64478845 in words is "sixty-four million, four hundred seventy-eight thousand, eight hundred forty-five".