63813387 has 16 divisors (see below), whose sum is σ = 93161088. Its totient is φ = 38532480.

The previous prime is 63813377. The next prime is 63813391. The reversal of 63813387 is 78331836.

It is not a de Polignac number, because 63813387 - 2¹⁹ = 63289099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63813307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5923 + ... + 12755.

It is an arithmetic number, because the mean of its divisors is an integer number (5822568).

Almost surely, 2^63813387 is an apocalyptic number.

63813387 is a deficient number, since it is larger than the sum of its proper divisors (29347701).

63813387 is a wasteful number, since it uses less digits than its factorization.

63813387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7130.

The product of its digits is 72576, while the sum is 39.

The square root of 63813387 is about 7988.3281730284. The cubic root of 63813387 is about 399.6108444343.

It can be divided in two parts, 63 and 813387, that added together give a triangular number (813450 = T₁₂₇₅).

The spelling of 63813387 in words is "sixty-three million, eight hundred thirteen thousand, three hundred eighty-seven".