63680491 has 24 divisors (see below), whose sum is σ = 78835680. Its totient is φ = 50324736.

The previous prime is 63680489. The next prime is 63680509. The reversal of 63680491 is 19408636.

It is not a de Polignac number, because 63680491 - 2¹ = 63680489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63680491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63680431) 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 23 ways as a sum of consecutive naturals, for example, 107091 + ... + 107683.

It is an arithmetic number, because the mean of its divisors is an integer number (3284820).

Almost surely, 2^63680491 is an apocalyptic number.

63680491 is a deficient number, since it is larger than the sum of its proper divisors (15155189).

63680491 is a wasteful number, since it uses less digits than its factorization.

63680491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 63680491 is about 7980.0057017523. The cubic root of 63680491 is about 399.3332454635. Note that the first 3 decimals are identical.

The spelling of 63680491 in words is "sixty-three million, six hundred eighty thousand, four hundred ninety-one".