63781344 has 120 divisors (see below), whose sum is σ = 204723288. Its totient is φ = 19319040.

The previous prime is 63781337. The next prime is 63781409. The reversal of 63781344 is 44318736.

63781344 is a `hidden beast` number, since 637 + 8 + 13 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 63781299 and 63781308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27394 + ... + 29630.

Almost surely, 2^63781344 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 63781344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102361644).

63781344 is an abundant number, since it is smaller than the sum of its proper divisors (140941944).

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

63781344 is a wasteful number, since it uses less digits than its factorization.

63781344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270 (or 2253 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 63781344 is about 7986.3223075456. The cubic root of 63781344 is about 399.5439469032.

The spelling of 63781344 in words is "sixty-three million, seven hundred eighty-one thousand, three hundred forty-four".