64478844 has 72 divisors (see below), whose sum is σ = 174125952. Its totient is φ = 20069280.

The previous prime is 64478839. The next prime is 64478849. The reversal of 64478844 is 44887446.

It is an interprime number because it is at equal distance from previous prime (64478839) and next prime (64478849).

It is a self number, because there is not a number n which added to its sum of digits gives 64478844.

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

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34699 + ... + 36509.

It is an arithmetic number, because the mean of its divisors is an integer number (2418416).

Almost surely, 2^64478844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64478844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87062976).

64478844 is an abundant number, since it is smaller than the sum of its proper divisors (109647108).

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

64478844 is a wasteful number, since it uses less digits than its factorization.

64478844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887 (or 1882 counting only the distinct ones).

The product of its digits is 688128, while the sum is 45.

The square root of 64478844 is about 8029.8719790542. The cubic root of 64478844 is about 400.9951139841.

The spelling of 64478844 in words is "sixty-four million, four hundred seventy-eight thousand, eight hundred forty-four".