63898385 has 4 divisors (see below), whose sum is σ = 76678068. Its totient is φ = 51118704.

The previous prime is 63898381. The next prime is 63898391. The reversal of 63898385 is 58389836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42627841 + 21270544 = 6529^2 + 4612^2 .

It is a cyclic number.

It is not a de Polignac number, because 63898385 - 2² = 63898381 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63898381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6389834 + ... + 6389843.

It is an arithmetic number, because the mean of its divisors is an integer number (19169517).

Almost surely, 2^63898385 is an apocalyptic number.

It is an amenable number.

63898385 is a deficient number, since it is larger than the sum of its proper divisors (12779683).

63898385 is a wasteful number, since it uses less digits than its factorization.

63898385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12779682.

The product of its digits is 1244160, while the sum is 50.

The square root of 63898385 is about 7993.6465395963. The cubic root of 63898385 is about 399.7881899444.

The spelling of 63898385 in words is "sixty-three million, eight hundred ninety-eight thousand, three hundred eighty-five".