63456381 has 12 divisors (see below), whose sum is σ = 92568060. Its totient is φ = 41884800.

The previous prime is 63456331. The next prime is 63456383. The reversal of 63456381 is 18365436.

63456381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 58660281 + 4796100 = 7659^2 + 2190^2 .

It is not a de Polignac number, because 63456381 - 2⁹ = 63455869 is a prime.

It is a super-2 number, since 2×63456381² = 8053424579234322, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63456383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33996 + ... + 35813.

It is an arithmetic number, because the mean of its divisors is an integer number (7714005).

Almost surely, 2^63456381 is an apocalyptic number.

It is an amenable number.

63456381 is a deficient number, since it is larger than the sum of its proper divisors (29111679).

63456381 is a wasteful number, since it uses less digits than its factorization.

63456381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69916 (or 69913 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 63456381 is about 7965.9513556135. The cubic root of 63456381 is about 398.8642385839.

The spelling of 63456381 in words is "sixty-three million, four hundred fifty-six thousand, three hundred eighty-one".