63978717 has 16 divisors (see below), whose sum is σ = 93588480. Its totient is φ = 38554800.

The previous prime is 63978689. The next prime is 63978721. The reversal of 63978717 is 71787936.

It is a happy number.

It is not a de Polignac number, because 63978717 - 2⁶ = 63978653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63979717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492 + ... + 11322.

It is an arithmetic number, because the mean of its divisors is an integer number (5849280).

Almost surely, 2^63978717 is an apocalyptic number.

It is an amenable number.

63978717 is a deficient number, since it is larger than the sum of its proper divisors (29609763).

63978717 is a wasteful number, since it uses less digits than its factorization.

63978717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11024.

The product of its digits is 444528, while the sum is 48.

The square root of 63978717 is about 7998.6697018942. The cubic root of 63978717 is about 399.9556555008.

The spelling of 63978717 in words is "sixty-three million, nine hundred seventy-eight thousand, seven hundred seventeen".