64878408 has 80 divisors (see below), whose sum is σ = 207694080. Its totient is φ = 18535392.

The previous prime is 64878403. The next prime is 64878421. The reversal of 64878408 is 80487846.

It is a super-2 number, since 2×64878408² = 8418415649228928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64878403) 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 19 ways as a sum of consecutive naturals, for example, 2616 + ... + 11687.

It is an arithmetic number, because the mean of its divisors is an integer number (2596176).

Almost surely, 2^64878408 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 64878408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103847040).

64878408 is an abundant number, since it is smaller than the sum of its proper divisors (142815672).

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

64878408 is a wasteful number, since it uses less digits than its factorization.

64878408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14328 (or 14315 counting only the distinct ones).

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

The square root of 64878408 is about 8054.7134027227. The cubic root of 64878408 is about 401.8217075260.

It can be divided in two parts, 648 and 78408, that multiplied together give a square (50808384 = 7128²).

The spelling of 64878408 in words is "sixty-four million, eight hundred seventy-eight thousand, four hundred eight".