63438440 has 32 divisors (see below), whose sum is σ = 153717480. Its totient is φ = 23423232.

The previous prime is 63438437. The next prime is 63438443. The reversal of 63438440 is 4483436.

It is an interprime number because it is at equal distance from previous prime (63438437) and next prime (63438443).

It can be written as a sum of positive squares in 4 ways, for example, as 57668836 + 5769604 = 7594^2 + 2402^2 .

It is a junction number, because it is equal to n+sod(n) for n = 63438397 and 63438406.

It is not an unprimeable number, because it can be changed into a prime (63438443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60479 + ... + 61518.

Almost surely, 2^63438440 is an apocalyptic number.

It is an amenable number.

63438440 is an abundant number, since it is smaller than the sum of its proper divisors (90279040).

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

63438440 is a wasteful number, since it uses less digits than its factorization.

63438440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122021 (or 122017 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 63438440 is about 7964.8251707115. The cubic root of 63438440 is about 398.8266447927.

The spelling of 63438440 in words is "sixty-three million, four hundred thirty-eight thousand, four hundred forty".