63812881 has 4 divisors (see below), whose sum is σ = 69614064. Its totient is φ = 58011700.

The previous prime is 63812867. The next prime is 63812891. The reversal of 63812881 is 18821836.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63812881 is a prime.

It is a super-2 number, since 2×63812881² = 8144167563040322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63812881.

It is not an unprimeable number, because it can be changed into a prime (63812891) 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, 2900575 + ... + 2900596.

It is an arithmetic number, because the mean of its divisors is an integer number (17403516).

Almost surely, 2^63812881 is an apocalyptic number.

It is an amenable number.

63812881 is a deficient number, since it is larger than the sum of its proper divisors (5801183).

63812881 is a wasteful number, since it uses less digits than its factorization.

63812881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5801182.

The product of its digits is 18432, while the sum is 37.

The square root of 63812881 is about 7988.2965017581. The cubic root of 63812881 is about 399.6097882107.

The spelling of 63812881 in words is "sixty-three million, eight hundred twelve thousand, eight hundred eighty-one".