63878656 has 80 divisors (see below), whose sum is σ = 139209840. Its totient is φ = 29163520.

The previous prime is 63878653. The next prime is 63878663. The reversal of 63878656 is 65687836.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63878653) 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, 356775 + ... + 356953.

It is an arithmetic number, because the mean of its divisors is an integer number (1740123).

Almost surely, 2^63878656 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 63878656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69604920).

63878656 is an abundant number, since it is smaller than the sum of its proper divisors (75331184).

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

63878656 is a wasteful number, since it uses less digits than its factorization.

63878656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 239 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The square root of 63878656 is about 7992.4124017721. The cubic root of 63878656 is about 399.7470400619.

The spelling of 63878656 in words is "sixty-three million, eight hundred seventy-eight thousand, six hundred fifty-six".