63978899 has 2 divisors, whose sum is σ = 63978900. Its totient is φ = 63978898.

The previous prime is 63978857. The next prime is 63978911. The reversal of 63978899 is 99887936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63978899 - 2¹⁶ = 63913363 is a prime.

It is not a weakly prime, because it can be changed into another prime (63978829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31989449 + 31989450.

It is an arithmetic number, because the mean of its divisors is an integer number (31989450).

Almost surely, 2^63978899 is an apocalyptic number.

63978899 is a deficient number, since it is larger than the sum of its proper divisors (1).

63978899 is an equidigital number, since it uses as much as digits as its factorization.

63978899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 59.

The square root of 63978899 is about 7998.6810787779. The cubic root of 63978899 is about 399.9560347512.

The spelling of 63978899 in words is "sixty-three million, nine hundred seventy-eight thousand, eight hundred ninety-nine".