63878457 has 4 divisors (see below), whose sum is σ = 85171280. Its totient is φ = 42585636.

The previous prime is 63878453. The next prime is 63878459. The reversal of 63878457 is 75487836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 63878457 - 2² = 63878453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63878453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10646407 + ... + 10646412.

It is an arithmetic number, because the mean of its divisors is an integer number (21292820).

Almost surely, 2^63878457 is an apocalyptic number.

It is an amenable number.

63878457 is a deficient number, since it is larger than the sum of its proper divisors (21292823).

63878457 is a wasteful number, since it uses less digits than its factorization.

63878457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21292822.

The product of its digits is 1128960, while the sum is 48.

The square root of 63878457 is about 7992.3999524548. The cubic root of 63878457 is about 399.7466249533.

The spelling of 63878457 in words is "sixty-three million, eight hundred seventy-eight thousand, four hundred fifty-seven".