63798781 has 2 divisors, whose sum is σ = 63798782. Its totient is φ = 63798780.

The previous prime is 63798737. The next prime is 63798797. The reversal of 63798781 is 18789736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45778756 + 18020025 = 6766^2 + 4245^2 .

It is a cyclic number.

It is not a de Polignac number, because 63798781 - 2⁹ = 63798269 is a prime.

It is a super-2 number, since 2×63798781² = 8140568914171922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63798701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31899390 + 31899391.

It is an arithmetic number, because the mean of its divisors is an integer number (31899391).

Almost surely, 2^63798781 is an apocalyptic number.

It is an amenable number.

63798781 is a deficient number, since it is larger than the sum of its proper divisors (1).

63798781 is an equidigital number, since it uses as much as digits as its factorization.

63798781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The square root of 63798781 is about 7987.4139118991. The cubic root of 63798781 is about 399.5803536463.

The spelling of 63798781 in words is "sixty-three million, seven hundred ninety-eight thousand, seven hundred eighty-one".