63647978 has 16 divisors (see below), whose sum is σ = 96764544. Its totient is φ = 31395600.

The previous prime is 63647971. The next prime is 63647981. The reversal of 63647978 is 87974636.

It is not an unprimeable number, because it can be changed into a prime (63647971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98051 + ... + 98697.

It is an arithmetic number, because the mean of its divisors is an integer number (6047784).

Almost surely, 2^63647978 is an apocalyptic number.

63647978 is a deficient number, since it is larger than the sum of its proper divisors (33116566).

63647978 is a wasteful number, since it uses less digits than its factorization.

63647978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237.

The product of its digits is 1524096, while the sum is 50.

The square root of 63647978 is about 7977.9682877284. The cubic root of 63647978 is about 399.2652720969.

The spelling of 63647978 in words is "sixty-three million, six hundred forty-seven thousand, nine hundred seventy-eight".