63878557 has 2 divisors, whose sum is σ = 63878558. Its totient is φ = 63878556.

The previous prime is 63878519. The next prime is 63878599. The reversal of 63878557 is 75587836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47183161 + 16695396 = 6869^2 + 4086^2 .

It is a cyclic number.

It is not a de Polignac number, because 63878557 - 2²³ = 55489949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63878557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63878257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31939278 + 31939279.

It is an arithmetic number, because the mean of its divisors is an integer number (31939279).

Almost surely, 2^63878557 is an apocalyptic number.

It is an amenable number.

63878557 is a deficient number, since it is larger than the sum of its proper divisors (1).

63878557 is an equidigital number, since it uses as much as digits as its factorization.

63878557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 49.

The square root of 63878557 is about 7992.4062083956. The cubic root of 63878557 is about 399.7468335507.

The spelling of 63878557 in words is "sixty-three million, eight hundred seventy-eight thousand, five hundred fifty-seven".