672721603 has 8 divisors (see below), whose sum is σ = 723971520. Its totient is φ = 622769280.

The previous prime is 672721601. The next prime is 672721639. The reversal of 672721603 is 306127276.

It is a happy number.

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 672721603 - 2¹ = 672721601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (672721601) 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, 323323 + ... + 325396.

It is an arithmetic number, because the mean of its divisors is an integer number (90496440).

Almost surely, 2^672721603 is an apocalyptic number.

672721603 is a deficient number, since it is larger than the sum of its proper divisors (51249917).

672721603 is a wasteful number, since it uses less digits than its factorization.

672721603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648797.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 672721603 is about 25936.8772792717. The cubic root of 672721603 is about 876.2172350849.

Adding to 672721603 its reverse (306127276), we get a palindrome (978848879).

The spelling of 672721603 in words is "six hundred seventy-two million, seven hundred twenty-one thousand, six hundred three".