63685073 has 4 divisors (see below), whose sum is σ = 65881140. Its totient is φ = 61489008.

The previous prime is 63685057. The next prime is 63685087. The reversal of 63685073 is 37058636.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42081169 + 21603904 = 6487^2 + 4648^2 .

It is a cyclic number.

It is not a de Polignac number, because 63685073 - 2⁴ = 63685057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63685033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097990 + ... + 1098047.

It is an arithmetic number, because the mean of its divisors is an integer number (16470285).

Almost surely, 2^63685073 is an apocalyptic number.

It is an amenable number.

63685073 is a deficient number, since it is larger than the sum of its proper divisors (2196067).

63685073 is a wasteful number, since it uses less digits than its factorization.

63685073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196066.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 63685073 is about 7980.2927891149. The cubic root of 63685073 is about 399.3428229705.

The spelling of 63685073 in words is "sixty-three million, six hundred eighty-five thousand, seventy-three".