670240321 has 3 divisors (see below), whose sum is σ = 670266211. Its totient is φ = 670214432.

The previous prime is 670240303. The next prime is 670240369. The reversal of 670240321 is 123042076.

The square root of 670240321 is 25889.

It is a perfect power (a square), and thus also a powerful number.

670240321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 640646721 + 29593600 = 25311^2 + 5440^2 .

It is not a de Polignac number, because 670240321 - 2¹⁷ = 670109249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670240381) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12945 + ... + 38833.

Almost surely, 2^670240321 is an apocalyptic number.

670240321 is the 25889-th square number.

670240321 is the 12945-th centered octagonal number.

It is an amenable number.

670240321 is a deficient number, since it is larger than the sum of its proper divisors (25890).

670240321 is an frugal number, since it uses more digits than its factorization.

670240321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51778 (or 25889 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The cubic root of 670240321 is about 875.1386211943.

Multiplying 670240321 by its sum of digits (25), we get a square (16756008025 = 129445²).

Adding to 670240321 its reverse (123042076), we get a palindrome (793282397).

The spelling of 670240321 in words is "six hundred seventy million, two hundred forty thousand, three hundred twenty-one".