64408321 has 8 divisors (see below), whose sum is σ = 65291400. Its totient is φ = 63528960.

The previous prime is 64408313. The next prime is 64408327. The reversal of 64408321 is 12380446.

64408321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2958400 + 61449921 = 1720^2 + 7839^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64408321 - 2³ = 64408313 is a prime.

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 64408321.

It is not an unprimeable number, because it can be changed into a prime (64408327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56485 + ... + 57613.

It is an arithmetic number, because the mean of its divisors is an integer number (8161425).

Almost surely, 2^64408321 is an apocalyptic number.

It is an amenable number.

64408321 is a deficient number, since it is larger than the sum of its proper divisors (883079).

64408321 is a wasteful number, since it uses less digits than its factorization.

64408321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 64408321 is about 8025.4794872331. The cubic root of 64408321 is about 400.8488660418.

Adding to 64408321 its reverse (12380446), we get a palindrome (76788767).

It can be divided in two parts, 64 and 408321, that multiplied together give a square (26132544 = 5112²).

The spelling of 64408321 in words is "sixty-four million, four hundred eight thousand, three hundred twenty-one".