64478646 has 32 divisors (see below), whose sum is σ = 143990400. Its totient is φ = 21387240.

The previous prime is 64478641. The next prime is 64478663. The reversal of 64478646 is 64687446.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64478641) 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 15 ways as a sum of consecutive naturals, for example, 8565 + ... + 14223.

It is an arithmetic number, because the mean of its divisors is an integer number (4499700).

Almost surely, 2^64478646 is an apocalyptic number.

64478646 is an abundant number, since it is smaller than the sum of its proper divisors (79511754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64478646 is a wasteful number, since it uses less digits than its factorization.

64478646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5881 (or 5875 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

The square root of 64478646 is about 8029.8596500811. The cubic root of 64478646 is about 400.9947035285.

The spelling of 64478646 in words is "sixty-four million, four hundred seventy-eight thousand, six hundred forty-six".