64444878 has 12 divisors (see below), whose sum is σ = 139630608. Its totient is φ = 21481620.

The previous prime is 64444871. The next prime is 64444879. The reversal of 64444878 is 87844446.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64444871) 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 5 ways as a sum of consecutive naturals, for example, 1790118 + ... + 1790153.

It is an arithmetic number, because the mean of its divisors is an integer number (11635884).

Almost surely, 2^64444878 is an apocalyptic number.

64444878 is an abundant number, since it is smaller than the sum of its proper divisors (75185730).

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

64444878 is a wasteful number, since it uses less digits than its factorization.

64444878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3580279 (or 3580276 counting only the distinct ones).

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

The square root of 64444878 is about 8027.7567227713. The cubic root of 64444878 is about 400.9246898910.

The spelling of 64444878 in words is "sixty-four million, four hundred forty-four thousand, eight hundred seventy-eight".