63859840 has 128 divisors (see below), whose sum is σ = 170968320. Its totient is φ = 22609920.

The previous prime is 63859813. The next prime is 63859879. The reversal of 63859840 is 4895836.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330784 + ... + 330976.

It is an arithmetic number, because the mean of its divisors is an integer number (1335690).

Almost surely, 2^63859840 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 63859840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85484160).

63859840 is an abundant number, since it is smaller than the sum of its proper divisors (107108480).

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

63859840 is a wasteful number, since it uses less digits than its factorization.

63859840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 63859840 is about 7991.2351986411. The cubic root of 63859840 is about 399.7077865803.

The spelling of 63859840 in words is "sixty-three million, eight hundred fifty-nine thousand, eight hundred forty".