63750781 has 2 divisors, whose sum is σ = 63750782. Its totient is φ = 63750780.

The previous prime is 63750769. The next prime is 63750803. The reversal of 63750781 is 18705736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59059225 + 4691556 = 7685^2 + 2166^2 .

It is a cyclic number.

It is not a de Polignac number, because 63750781 - 2⁵ = 63750749 is a prime.

It is a super-2 number, since 2×63750781² = 8128324156219922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 63750781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63750761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31875390 + 31875391.

It is an arithmetic number, because the mean of its divisors is an integer number (31875391).

Almost surely, 2^63750781 is an apocalyptic number.

It is an amenable number.

63750781 is a deficient number, since it is larger than the sum of its proper divisors (1).

63750781 is an equidigital number, since it uses as much as digits as its factorization.

63750781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 63750781 is about 7984.4086193030. The cubic root of 63750781 is about 399.4801183504.

The spelling of 63750781 in words is "sixty-three million, seven hundred fifty thousand, seven hundred eighty-one".