63723978 has 24 divisors (see below), whose sum is σ = 138217248. Its totient is φ = 21218472.

The previous prime is 63723971. The next prime is 63724009. The reversal of 63723978 is 87932736.

It is a happy number.

63723978 is a `hidden beast` number, since 637 + 2 + 3 + 9 + 7 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (63723971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27825 + ... + 30027.

It is an arithmetic number, because the mean of its divisors is an integer number (5759052).

Almost surely, 2^63723978 is an apocalyptic number.

63723978 is an abundant number, since it is smaller than the sum of its proper divisors (74493270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63723978 is a wasteful number, since it uses less digits than its factorization.

63723978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3818 (or 3815 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 63723978 is about 7982.7299841596. The cubic root of 63723978 is about 399.4241254859.

The spelling of 63723978 in words is "sixty-three million, seven hundred twenty-three thousand, nine hundred seventy-eight".