64878222 has 16 divisors (see below), whose sum is σ = 137389392. Its totient is φ = 20353920.

The previous prime is 64878221. The next prime is 64878269. The reversal of 64878222 is 22287846.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317929 + ... + 318132.

It is an arithmetic number, because the mean of its divisors is an integer number (8586837).

Almost surely, 2^64878222 is an apocalyptic number.

64878222 is an abundant number, since it is smaller than the sum of its proper divisors (72511170).

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

64878222 is a wasteful number, since it uses less digits than its factorization.

64878222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636083.

The product of its digits is 86016, while the sum is 39.

The square root of 64878222 is about 8054.7018566797. The cubic root of 64878222 is about 401.8213235312.

The spelling of 64878222 in words is "sixty-four million, eight hundred seventy-eight thousand, two hundred twenty-two".