63440321 has 4 divisors (see below), whose sum is σ = 72503232. Its totient is φ = 54377412.

The previous prime is 63440317. The next prime is 63440323. The reversal of 63440321 is 12304436.

It is a happy number.

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 63440321 - 2² = 63440317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63440323) 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, 4531445 + ... + 4531458.

It is an arithmetic number, because the mean of its divisors is an integer number (18125808).

Almost surely, 2^63440321 is an apocalyptic number.

It is an amenable number.

63440321 is a deficient number, since it is larger than the sum of its proper divisors (9062911).

63440321 is an equidigital number, since it uses as much as digits as its factorization.

63440321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9062910.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 63440321 is about 7964.9432515241. The cubic root of 63440321 is about 398.8305865957.

Adding to 63440321 its reverse (12304436), we get a palindrome (75744757).

The spelling of 63440321 in words is "sixty-three million, four hundred forty thousand, three hundred twenty-one".