63857869 has 4 divisors (see below), whose sum is σ = 65415420. Its totient is φ = 62300320.

The previous prime is 63857863. The next prime is 63857873. The reversal of 63857869 is 96875836.

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 36421225 + 27436644 = 6035^2 + 5238^2 .

It is not a de Polignac number, because 63857869 - 2⁷ = 63857741 is a prime.

It is a super-2 number, since 2×63857869² = 8155654866442322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63857863) 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, 778714 + ... + 778795.

It is an arithmetic number, because the mean of its divisors is an integer number (16353855).

Almost surely, 2^63857869 is an apocalyptic number.

It is an amenable number.

63857869 is a deficient number, since it is larger than the sum of its proper divisors (1557551).

63857869 is a wasteful number, since it uses less digits than its factorization.

63857869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557550.

The product of its digits is 2177280, while the sum is 52.

The square root of 63857869 is about 7991.1118750772. Note that the first 3 decimals coincide. The cubic root of 63857869 is about 399.7036742819.

The spelling of 63857869 in words is "sixty-three million, eight hundred fifty-seven thousand, eight hundred sixty-nine".