64478856 has 128 divisors (see below), whose sum is σ = 186480000. Its totient is φ = 18413568.

The previous prime is 64478851. The next prime is 64478881. The reversal of 64478856 is 65887446.

It is not an unprimeable number, because it can be changed into a prime (64478851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432670 + ... + 432818.

It is an arithmetic number, because the mean of its divisors is an integer number (1456875).

Almost surely, 2^64478856 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 64478856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93240000).

64478856 is an abundant number, since it is smaller than the sum of its proper divisors (122001144).

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

64478856 is a wasteful number, since it uses less digits than its factorization.

64478856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 259 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 48.

The square root of 64478856 is about 8029.8727262641. The cubic root of 64478856 is about 400.9951388602.

The spelling of 64478856 in words is "sixty-four million, four hundred seventy-eight thousand, eight hundred fifty-six".