63857481 has 8 divisors (see below), whose sum is σ = 85765344. Its totient is φ = 42260640.

The previous prime is 63857477. The next prime is 63857483. The reversal of 63857481 is 18475836.

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

It is not a de Polignac number, because 63857481 - 2² = 63857477 is a prime.

It is a super-2 number, since 2×63857481² = 8155555759330722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63857483) 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, 77275 + ... + 78096.

It is an arithmetic number, because the mean of its divisors is an integer number (10720668).

Almost surely, 2^63857481 is an apocalyptic number.

It is an amenable number.

63857481 is a deficient number, since it is larger than the sum of its proper divisors (21907863).

63857481 is a wasteful number, since it uses less digits than its factorization.

63857481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155511.

The product of its digits is 161280, while the sum is 42.

The square root of 63857481 is about 7991.0875980682. The cubic root of 63857481 is about 399.7028647479.

The spelling of 63857481 in words is "sixty-three million, eight hundred fifty-seven thousand, four hundred eighty-one".