63649978 has 8 divisors (see below), whose sum is σ = 109114272. Its totient is φ = 27278556.

The previous prime is 63649931. The next prime is 63649991. The reversal of 63649978 is 87994636.

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

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, 2273200 + ... + 2273227.

It is an arithmetic number, because the mean of its divisors is an integer number (13639284).

Almost surely, 2^63649978 is an apocalyptic number.

63649978 is a deficient number, since it is larger than the sum of its proper divisors (45464294).

63649978 is a wasteful number, since it uses less digits than its factorization.

63649978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546436.

The product of its digits is 1959552, while the sum is 52.

The square root of 63649978 is about 7978.0936319399. The cubic root of 63649978 is about 399.2694540689.

The spelling of 63649978 in words is "sixty-three million, six hundred forty-nine thousand, nine hundred seventy-eight".