63648869 has 2 divisors, whose sum is σ = 63648870. Its totient is φ = 63648868.

The previous prime is 63648847. The next prime is 63648913. The reversal of 63648869 is 96884636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42837025 + 20811844 = 6545^2 + 4562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63648869 is a prime.

It is a super-2 number, since 2×63648869² = 8102357049958322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63648829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31824434 + 31824435.

It is an arithmetic number, because the mean of its divisors is an integer number (31824435).

Almost surely, 2^63648869 is an apocalyptic number.

It is an amenable number.

63648869 is a deficient number, since it is larger than the sum of its proper divisors (1).

63648869 is an equidigital number, since it uses as much as digits as its factorization.

63648869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 50.

The square root of 63648869 is about 7978.0241288179. The cubic root of 63648869 is about 399.2671351762.

The spelling of 63648869 in words is "sixty-three million, six hundred forty-eight thousand, eight hundred sixty-nine".