63305978 has 4 divisors (see below), whose sum is σ = 94958970. Its totient is φ = 31652988.

The previous prime is 63305971. The next prime is 63305981. The reversal of 63305978 is 87950336.

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., 46553329 + 16752649 = 6823^2 + 4093^2 .

It is not an unprimeable number, because it can be changed into a prime (63305971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15826493 + ... + 15826496.

Almost surely, 2^63305978 is an apocalyptic number.

63305978 is a deficient number, since it is larger than the sum of its proper divisors (31652992).

63305978 is a wasteful number, since it uses less digits than its factorization.

63305978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31652991.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 63305978 is about 7956.5053886741. The cubic root of 63305978 is about 398.5488627009.

The spelling of 63305978 in words is "sixty-three million, three hundred five thousand, nine hundred seventy-eight".