63857868 has 24 divisors (see below), whose sum is σ = 150371760. Its totient is φ = 21090240.

The previous prime is 63857863. The next prime is 63857873. The reversal of 63857868 is 86875836.

It is an interprime number because it is at equal distance from previous prime (63857863) and next prime (63857873).

It is a self number, because there is not a number n which added to its sum of digits gives 63857868.

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 7 ways as a sum of consecutive naturals, for example, 23103 + ... + 25718.

It is an arithmetic number, because the mean of its divisors is an integer number (6265490).

Almost surely, 2^63857868 is an apocalyptic number.

It is an amenable number.

63857868 is an abundant number, since it is smaller than the sum of its proper divisors (86513892).

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

63857868 is a wasteful number, since it uses less digits than its factorization.

63857868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48937 (or 48935 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The square root of 63857868 is about 7991.1118125077. Note that the first 3 decimals coincide. The cubic root of 63857868 is about 399.7036721955.

The spelling of 63857868 in words is "sixty-three million, eight hundred fifty-seven thousand, eight hundred sixty-eight".