63785813 has 16 divisors (see below), whose sum is σ = 80336256. Its totient is φ = 49291200.

The previous prime is 63785801. The next prime is 63785833. The reversal of 63785813 is 31858736.

It is not a de Polignac number, because 63785813 - 2¹⁶ = 63720277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63785833) 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, 4238 + ... + 12063.

It is an arithmetic number, because the mean of its divisors is an integer number (5021016).

Almost surely, 2^63785813 is an apocalyptic number.

It is an amenable number.

63785813 is a deficient number, since it is larger than the sum of its proper divisors (16550443).

63785813 is a wasteful number, since it uses less digits than its factorization.

63785813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16364.

The product of its digits is 120960, while the sum is 41.

The square root of 63785813 is about 7986.6020935063. The cubic root of 63785813 is about 399.5532783685.

The spelling of 63785813 in words is "sixty-three million, seven hundred eighty-five thousand, eight hundred thirteen".