63863857 has 2 divisors, whose sum is σ = 63863858. Its totient is φ = 63863856.

The previous prime is 63863851. The next prime is 63863869. The reversal of 63863857 is 75836836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57289761 + 6574096 = 7569^2 + 2564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63863857 is a prime.

It is not a weakly prime, because it can be changed into another prime (63863851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31931928 + 31931929.

It is an arithmetic number, because the mean of its divisors is an integer number (31931929).

Almost surely, 2^63863857 is an apocalyptic number.

It is an amenable number.

63863857 is a deficient number, since it is larger than the sum of its proper divisors (1).

63863857 is an equidigital number, since it uses as much as digits as its factorization.

63863857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The square root of 63863857 is about 7991.4865325545. The cubic root of 63863857 is about 399.7161673953.

The spelling of 63863857 in words is "sixty-three million, eight hundred sixty-three thousand, eight hundred fifty-seven".