63840089 has 2 divisors, whose sum is σ = 63840090. Its totient is φ = 63840088.

The previous prime is 63840071. The next prime is 63840103. The reversal of 63840089 is 98004836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42680089 + 21160000 = 6533^2 + 4600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63840089 is a prime.

It is not a weakly prime, because it can be changed into another prime (63846089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31920044 + 31920045.

It is an arithmetic number, because the mean of its divisors is an integer number (31920045).

Almost surely, 2^63840089 is an apocalyptic number.

It is an amenable number.

63840089 is a deficient number, since it is larger than the sum of its proper divisors (1).

63840089 is an equidigital number, since it uses as much as digits as its factorization.

63840089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 63840089 is about 7989.9993116395. Note that the first 3 decimals coincide. The cubic root of 63840089 is about 399.6665742287. Note that the first 3 decimals are identical.

The spelling of 63840089 in words is "sixty-three million, eight hundred forty thousand, eighty-nine".