63865481 has 4 divisors (see below), whose sum is σ = 67622292. Its totient is φ = 60108672.

The previous prime is 63865471. The next prime is 63865489. The reversal of 63865481 is 18456836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21939856 + 41925625 = 4684^2 + 6475^2 .

It is a cyclic number.

It is not a de Polignac number, because 63865481 - 2¹⁰ = 63864457 is a prime.

It is a super-2 number, since 2×63865481² = 8157599326722722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63865489) 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, 1878380 + ... + 1878413.

It is an arithmetic number, because the mean of its divisors is an integer number (16905573).

Almost surely, 2^63865481 is an apocalyptic number.

It is an amenable number.

63865481 is a deficient number, since it is larger than the sum of its proper divisors (3756811).

63865481 is a wasteful number, since it uses less digits than its factorization.

63865481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3756810.

The product of its digits is 138240, while the sum is 41.

The square root of 63865481 is about 7991.5881400382. The cubic root of 63865481 is about 399.7195555065.

It can be divided in two parts, 63865 and 481, that added together give a palindrome (64346).

The spelling of 63865481 in words is "sixty-three million, eight hundred sixty-five thousand, four hundred eighty-one".