64878228 has 36 divisors (see below), whose sum is σ = 167815648. Its totient is φ = 21122640.

The previous prime is 64878221. The next prime is 64878269. The reversal of 64878228 is 82287846.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64878221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19408 + ... + 22503.

Almost surely, 2^64878228 is an apocalyptic number.

It is an amenable number.

64878228 is an abundant number, since it is smaller than the sum of its proper divisors (102937420).

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

64878228 is a wasteful number, since it uses less digits than its factorization.

64878228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41964 (or 41959 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 64878228 is about 8054.7022291330. The cubic root of 64878228 is about 401.8213359182.

The spelling of 64878228 in words is "sixty-four million, eight hundred seventy-eight thousand, two hundred twenty-eight".