63978773 has 4 divisors (see below), whose sum is σ = 64109568. Its totient is φ = 63847980.

The previous prime is 63978751. The next prime is 63978793. The reversal of 63978773 is 37787936.

63978773 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63978773 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 (63978793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64661 + ... + 65642.

It is an arithmetic number, because the mean of its divisors is an integer number (16027392).

Almost surely, 2^63978773 is an apocalyptic number.

It is an amenable number.

63978773 is a deficient number, since it is larger than the sum of its proper divisors (130795).

63978773 is a wasteful number, since it uses less digits than its factorization.

63978773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130794.

The product of its digits is 1333584, while the sum is 50.

The square root of 63978773 is about 7998.6732024755. The cubic root of 63978773 is about 399.9557721933.

The spelling of 63978773 in words is "sixty-three million, nine hundred seventy-eight thousand, seven hundred seventy-three".