63503978 has 4 divisors (see below), whose sum is σ = 95255970. Its totient is φ = 31751988.

The previous prime is 63503977. The next prime is 63503981. The reversal of 63503978 is 87930536.

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., 62047129 + 1456849 = 7877^2 + 1207^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63503977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15875993 + ... + 15875996.

Almost surely, 2^63503978 is an apocalyptic number.

63503978 is a deficient number, since it is larger than the sum of its proper divisors (31751992).

63503978 is a wasteful number, since it uses less digits than its factorization.

63503978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31751991.

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

The square root of 63503978 is about 7968.9383232649. The cubic root of 63503978 is about 398.9639395974.

The spelling of 63503978 in words is "sixty-three million, five hundred three thousand, nine hundred seventy-eight".