63721066 has 16 divisors (see below), whose sum is σ = 101366856. Its totient is φ = 29938176.

The previous prime is 63721037. The next prime is 63721111. The reversal of 63721066 is 66012736.

It can be written as a sum of positive squares in 4 ways, for example, as 56565441 + 7155625 = 7521^2 + 2675^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28750 + ... + 30886.

Almost surely, 2^63721066 is an apocalyptic number.

63721066 is a deficient number, since it is larger than the sum of its proper divisors (37645790).

63721066 is a wasteful number, since it uses less digits than its factorization.

63721066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 63721066 is about 7982.5475883329. The cubic root of 63721066 is about 399.4180412206.

The spelling of 63721066 in words is "sixty-three million, seven hundred twenty-one thousand, sixty-six".