64578646 has 16 divisors (see below), whose sum is σ = 105947280. Its totient is φ = 29278080.

The previous prime is 64578643. The next prime is 64578671. The reversal of 64578646 is 64687546.

It is a junction number, because it is equal to n+sod(n) for n = 64578596 and 64578605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64578643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5410 + ... + 12586.

It is an arithmetic number, because the mean of its divisors is an integer number (6621705).

Almost surely, 2^64578646 is an apocalyptic number.

64578646 is a deficient number, since it is larger than the sum of its proper divisors (41368634).

64578646 is a wasteful number, since it uses less digits than its factorization.

64578646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7599.

The product of its digits is 967680, while the sum is 46.

The square root of 64578646 is about 8036.0839965745. The cubic root of 64578646 is about 401.2018974890.

Subtracting 64578646 from its reverse (64687546), we obtain a square (108900 = 330²).

The spelling of 64578646 in words is "sixty-four million, five hundred seventy-eight thousand, six hundred forty-six".