63431680 has 88 divisors (see below), whose sum is σ = 164038392. Its totient is φ = 23396352.

The previous prime is 63431659. The next prime is 63431689. The reversal of 63431680 is 8613436.

It can be written as a sum of positive squares in 4 ways, for example, as 451584 + 62980096 = 672^2 + 7936^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63431689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66084 + ... + 67036.

Almost surely, 2^63431680 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 63431680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82019196).

63431680 is an abundant number, since it is smaller than the sum of its proper divisors (100606712).

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

63431680 is a wasteful number, since it uses less digits than its factorization.

63431680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 63431680 is about 7964.4007935312. The cubic root of 63431680 is about 398.8124779674.

The spelling of 63431680 in words is "sixty-three million, four hundred thirty-one thousand, six hundred eighty".