63634321 has 4 divisors (see below), whose sum is σ = 63990000. Its totient is φ = 63278644.

The previous prime is 63634313. The next prime is 63634331. The reversal of 63634321 is 12343636.

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 not a de Polignac number, because 63634321 - 2³ = 63634313 is a prime.

It is an alternating number because its digits alternate between even and odd.

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 63634321.

It is not an unprimeable number, because it can be changed into a prime (63634331) 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, 177571 + ... + 177928.

It is an arithmetic number, because the mean of its divisors is an integer number (15997500).

Almost surely, 2^63634321 is an apocalyptic number.

It is an amenable number.

63634321 is a deficient number, since it is larger than the sum of its proper divisors (355679).

63634321 is a wasteful number, since it uses less digits than its factorization.

63634321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355678.

The product of its digits is 7776, while the sum is 28.

The square root of 63634321 is about 7977.1123221376. The cubic root of 63634321 is about 399.2367131594.

Adding to 63634321 its reverse (12343636), we get a palindrome (75977957).

The spelling of 63634321 in words is "sixty-three million, six hundred thirty-four thousand, three hundred twenty-one".