63709685 has 8 divisors (see below), whose sum is σ = 82332600. Its totient is φ = 47047104.

The previous prime is 63709669. The next prime is 63709687. The reversal of 63709685 is 58690736.

It can be written as a sum of positive squares in 4 ways, for example, as 15295921 + 48413764 = 3911^2 + 6958^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63709685 - 2⁴ = 63709669 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63709687) 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, 490010 + ... + 490139.

It is an arithmetic number, because the mean of its divisors is an integer number (10291575).

Almost surely, 2^63709685 is an apocalyptic number.

63709685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

63709685 is a deficient number, since it is larger than the sum of its proper divisors (18622915).

63709685 is a wasteful number, since it uses less digits than its factorization.

63709685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980167.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 63709685 is about 7981.8346888419. The cubic root of 63709685 is about 399.3942602447.

The spelling of 63709685 in words is "sixty-three million, seven hundred nine thousand, six hundred eighty-five".