63533840 has 20 divisors (see below), whose sum is σ = 147716364. Its totient is φ = 25413504.

The previous prime is 63533839. The next prime is 63533851. The reversal of 63533840 is 4833536.

It can be written as a sum of positive squares in 2 ways, for example, as 33547264 + 29986576 = 5792^2 + 5476^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 63533797 and 63533806.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397007 + ... + 397166.

Almost surely, 2^63533840 is an apocalyptic number.

It is an amenable number.

63533840 is an abundant number, since it is smaller than the sum of its proper divisors (84182524).

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

63533840 is a wasteful number, since it uses less digits than its factorization.

63533840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794186 (or 794180 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 63533840 is about 7970.8117528894. The cubic root of 63533840 is about 399.0264658337.

The spelling of 63533840 in words is "sixty-three million, five hundred thirty-three thousand, eight hundred forty".