64878220188 has 48 divisors (see below), whose sum is σ = 168545502720. Its totient is φ = 21582010800.

The previous prime is 64878220177. The next prime is 64878220189. The reversal of 64878220188 is 88102287846.

64878220188 is a `hidden beast` number, since 6 + 487 + 82 + 2 + 0 + 1 + 88 = 666.

64878220188 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64878220188² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64878220189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558708 + ... + 664763.

It is an arithmetic number, because the mean of its divisors is an integer number (3511364640).

Almost surely, 2^64878220188 is an apocalyptic number.

It is an amenable number.

64878220188 is an abundant number, since it is smaller than the sum of its proper divisors (103667282532).

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

64878220188 is a wasteful number, since it uses less digits than its factorization.

64878220188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223975 (or 1223967 counting only the distinct ones).

The product of its (nonzero) digits is 2752512, while the sum is 54.

The spelling of 64878220188 in words is "sixty-four billion, eight hundred seventy-eight million, two hundred twenty thousand, one hundred eighty-eight".