464665721 has 8 divisors (see below), whose sum is σ = 513934344. Its totient is φ = 417329280.

The previous prime is 464665679. The next prime is 464665739. The reversal of 464665721 is 127566464.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17935225 + 446730496 = 4235^2 + 21136^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-464665721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (464665771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482540 + ... + 483501.

It is an arithmetic number, because the mean of its divisors is an integer number (64241793).

Almost surely, 2^464665721 is an apocalyptic number.

It is an amenable number.

464665721 is a deficient number, since it is larger than the sum of its proper divisors (49268623).

464665721 is a wasteful number, since it uses less digits than its factorization.

464665721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966091.

The product of its digits is 241920, while the sum is 41.

The square root of 464665721 is about 21556.1063506376. The cubic root of 464665721 is about 774.5453988786.

The spelling of 464665721 in words is "four hundred sixty-four million, six hundred sixty-five thousand, seven hundred twenty-one".