63688840 has 64 divisors (see below), whose sum is σ = 153653760. Its totient is φ = 23696640.

The previous prime is 63688811. The next prime is 63688847. The reversal of 63688840 is 4888636.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (63688847) 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, 33105 + ... + 34975.

It is an arithmetic number, because the mean of its divisors is an integer number (2400840).

Almost surely, 2^63688840 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 63688840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76826880).

63688840 is an abundant number, since it is smaller than the sum of its proper divisors (89964920).

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

63688840 is a wasteful number, since it uses less digits than its factorization.

63688840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1942 (or 1938 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 63688840 is about 7980.5288045342. The cubic root of 63688840 is about 399.3506965830.

The spelling of 63688840 in words is "sixty-three million, six hundred eighty-eight thousand, eight hundred forty".