63720887 has 2 divisors, whose sum is σ = 63720888. Its totient is φ = 63720886.

The previous prime is 63720871. The next prime is 63720901. The reversal of 63720887 is 78802736.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63720887 - 2⁴ = 63720871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63720817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31860443 + 31860444.

It is an arithmetic number, because the mean of its divisors is an integer number (31860444).

Almost surely, 2^63720887 is an apocalyptic number.

63720887 is a deficient number, since it is larger than the sum of its proper divisors (1).

63720887 is an equidigital number, since it uses as much as digits as its factorization.

63720887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 63720887 is about 7982.5363763656. The cubic root of 63720887 is about 399.4176672161.

The spelling of 63720887 in words is "sixty-three million, seven hundred twenty thousand, eight hundred eighty-seven".