63438820 has 12 divisors (see below), whose sum is σ = 133221564. Its totient is φ = 25375520.

The previous prime is 63438799. The next prime is 63438821. The reversal of 63438820 is 2883436.

It can be written as a sum of positive squares in 2 ways, for example, as 46348864 + 17089956 = 6808^2 + 4134^2 .

It is not an unprimeable number, because it can be changed into a prime (63438821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1585951 + ... + 1585990.

It is an arithmetic number, because the mean of its divisors is an integer number (11101797).

Almost surely, 2^63438820 is an apocalyptic number.

It is an amenable number.

63438820 is an abundant number, since it is smaller than the sum of its proper divisors (69782744).

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

63438820 is a wasteful number, since it uses less digits than its factorization.

63438820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3171950 (or 3171948 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 63438820 is about 7964.8490255623. The cubic root of 63438820 is about 398.8274411228.

The spelling of 63438820 in words is "sixty-three million, four hundred thirty-eight thousand, eight hundred twenty".