670543621 has 8 divisors (see below), whose sum is σ = 733578624. Its totient is φ = 607854720.

The previous prime is 670543613. The next prime is 670543661. The reversal of 670543621 is 126345076.

It is a happy number.

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

It is not a de Polignac number, because 670543621 - 2³ = 670543613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670543661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82461 + ... + 90226.

It is an arithmetic number, because the mean of its divisors is an integer number (91697328).

Almost surely, 2^670543621 is an apocalyptic number.

It is an amenable number.

670543621 is a deficient number, since it is larger than the sum of its proper divisors (63035003).

670543621 is a wasteful number, since it uses less digits than its factorization.

670543621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173051.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 670543621 is about 25894.8570376436. The cubic root of 670543621 is about 875.2706084372.

Adding to 670543621 its reverse (126345076), we get a palindrome (796888697).

The spelling of 670543621 in words is "six hundred seventy million, five hundred forty-three thousand, six hundred twenty-one".