63998138 has 8 divisors (see below), whose sum is σ = 96043860. Its totient is φ = 31983520.

The previous prime is 63998119. The next prime is 63998153. The reversal of 63998138 is 83189936.

It can be written as a sum of positive squares in 2 ways, for example, as 58629649 + 5368489 = 7657^2 + 2317^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

Its product of digits (279936) is a multiple of the sum of its prime divisors (15552).

It is a junction number, because it is equal to n+sod(n) for n = 63998092 and 63998101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1673 + ... + 11436.

Almost surely, 2^63998138 is an apocalyptic number.

63998138 is a deficient number, since it is larger than the sum of its proper divisors (32045722).

63998138 is a wasteful number, since it uses less digits than its factorization.

63998138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15552.

The product of its digits is 279936, while the sum is 47.

The square root of 63998138 is about 7999.8836241535. The cubic root of 63998138 is about 399.9961207957.

The spelling of 63998138 in words is "sixty-three million, nine hundred ninety-eight thousand, one hundred thirty-eight".