63681407 has 4 divisors (see below), whose sum is σ = 67033080. Its totient is φ = 60329736.

The previous prime is 63681389. The next prime is 63681413. The reversal of 63681407 is 70418636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63681407 - 2¹² = 63677311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63681437) 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 3 ways as a sum of consecutive naturals, for example, 1675808 + ... + 1675845.

It is an arithmetic number, because the mean of its divisors is an integer number (16758270).

Almost surely, 2^63681407 is an apocalyptic number.

63681407 is a deficient number, since it is larger than the sum of its proper divisors (3351673).

63681407 is a wasteful number, since it uses less digits than its factorization.

63681407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351672.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 63681407 is about 7980.0630949887. The cubic root of 63681407 is about 399.3351601655.

The spelling of 63681407 in words is "sixty-three million, six hundred eighty-one thousand, four hundred seven".