63680391 has 16 divisors (see below), whose sum is σ = 94483200. Its totient is φ = 42389784.

The previous prime is 63680389. The next prime is 63680423. The reversal of 63680391 is 19308636.

It is a happy number.

It is not a de Polignac number, because 63680391 - 2¹ = 63680389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63680311) 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 15 ways as a sum of consecutive naturals, for example, 22620 + ... + 25278.

It is an arithmetic number, because the mean of its divisors is an integer number (5905200).

Almost surely, 2^63680391 is an apocalyptic number.

63680391 is a deficient number, since it is larger than the sum of its proper divisors (30802809).

63680391 is a wasteful number, since it uses less digits than its factorization.

63680391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3555 (or 3549 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 63680391 is about 7979.9994360902. Note that the first 3 decimals coincide. The cubic root of 63680391 is about 399.3330364338. Note that the first 3 decimals are identical.

The spelling of 63680391 in words is "sixty-three million, six hundred eighty thousand, three hundred ninety-one".