63491216 has 10 divisors (see below), whose sum is σ = 123014262. Its totient is φ = 31745600.

The previous prime is 63491213. The next prime is 63491227. The reversal of 63491216 is 61219436.

It can be written as a sum of positive squares in only one way, i.e., 46185616 + 17305600 = 6796^2 + 4160^2 .

It is a super-2 number, since 2×63491216² = 8062269018317312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63491213) 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 as a sum of consecutive naturals, namely, 1984085 + ... + 1984116.

Almost surely, 2^63491216 is an apocalyptic number.

It is an amenable number.

63491216 is a deficient number, since it is larger than the sum of its proper divisors (59523046).

63491216 is a wasteful number, since it uses less digits than its factorization.

63491216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3968209 (or 3968203 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 63491216 is about 7968.1375490136. The cubic root of 63491216 is about 398.9372120386.

The spelling of 63491216 in words is "sixty-three million, four hundred ninety-one thousand, two hundred sixteen".