63688906 has 4 divisors (see below), whose sum is σ = 95533362. Its totient is φ = 31844452.

The previous prime is 63688897. The next prime is 63688943. The reversal of 63688906 is 60988636.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 37933281 + 25755625 = 6159^2 + 5075^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15922225 + ... + 15922228.

Almost surely, 2^63688906 is an apocalyptic number.

63688906 is a deficient number, since it is larger than the sum of its proper divisors (31844456).

63688906 is a wasteful number, since it uses less digits than its factorization.

63688906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31844455.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 63688906 is about 7980.5329395975. The cubic root of 63688906 is about 399.3508345304.

The spelling of 63688906 in words is "sixty-three million, six hundred eighty-eight thousand, nine hundred six".