63403840 has 56 divisors (see below), whose sum is σ = 151680672. Its totient is φ = 25244160.

The previous prime is 63403811. The next prime is 63403841. The reversal of 63403840 is 4830436.

It is a junction number, because it is equal to n+sod(n) for n = 63403799 and 63403808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63403841) 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, 110755 + ... + 111325.

Almost surely, 2^63403840 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 63403840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75840336).

63403840 is an abundant number, since it is smaller than the sum of its proper divisors (88276832).

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

63403840 is a wasteful number, since it uses less digits than its factorization.

63403840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935 (or 925 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 63403840 is about 7962.6528242791. The cubic root of 63403840 is about 398.7541235083.

The spelling of 63403840 in words is "sixty-three million, four hundred three thousand, eight hundred forty".