63897787 has 2 divisors, whose sum is σ = 63897788. Its totient is φ = 63897786.

The previous prime is 63897773. The next prime is 63897791. The reversal of 63897787 is 78779836.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63897787 is a prime.

It is not a weakly prime, because it can be changed into another prime (63897797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31948893 + 31948894.

It is an arithmetic number, because the mean of its divisors is an integer number (31948894).

Almost surely, 2^63897787 is an apocalyptic number.

63897787 is a deficient number, since it is larger than the sum of its proper divisors (1).

63897787 is an equidigital number, since it uses as much as digits as its factorization.

63897787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 55.

The square root of 63897787 is about 7993.6091348026. The cubic root of 63897787 is about 399.7869427867.

The spelling of 63897787 in words is "sixty-three million, eight hundred ninety-seven thousand, seven hundred eighty-seven".