63880813 has 2 divisors, whose sum is σ = 63880814. Its totient is φ = 63880812.

The previous prime is 63880807. The next prime is 63880871. The reversal of 63880813 is 31808836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43059844 + 20820969 = 6562^2 + 4563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63880813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63880513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31940406 + 31940407.

It is an arithmetic number, because the mean of its divisors is an integer number (31940407).

Almost surely, 2^63880813 is an apocalyptic number.

It is an amenable number.

63880813 is a deficient number, since it is larger than the sum of its proper divisors (1).

63880813 is an equidigital number, since it uses as much as digits as its factorization.

63880813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 63880813 is about 7992.5473411172. The cubic root of 63880813 is about 399.7515394503.

The spelling of 63880813 in words is "sixty-three million, eight hundred eighty thousand, eight hundred thirteen".