63387855 has 12 divisors (see below), whose sum is σ = 109872360. Its totient is φ = 33806832.

The previous prime is 63387853. The next prime is 63387893. The reversal of 63387855 is 55878336.

63387855 is a `hidden beast` number, since 633 + 8 + 7 + 8 + 5 + 5 = 666.

It is not a de Polignac number, because 63387855 - 2¹ = 63387853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1408619 = 63387855 / (6 + 3 + 3 + 8 + 7 + 8 + 5 + 5).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 63387855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63387853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 704265 + ... + 704354.

It is an arithmetic number, because the mean of its divisors is an integer number (9156030).

Almost surely, 2^63387855 is an apocalyptic number.

63387855 is a deficient number, since it is larger than the sum of its proper divisors (46484505).

63387855 is a wasteful number, since it uses less digits than its factorization.

63387855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408630 (or 1408627 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 63387855 is about 7961.6490126104. The cubic root of 63387855 is about 398.7206101837.

It can be divided in two parts, 633 and 87855, that added together give a palindrome (88488).

The spelling of 63387855 in words is "sixty-three million, three hundred eighty-seven thousand, eight hundred fifty-five".