672721653 has 8 divisors (see below), whose sum is σ = 898058016. Its totient is φ = 447933200.

The previous prime is 672721639. The next prime is 672721681. The reversal of 672721653 is 356127276.

672721653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 672721653 - 2⁸ = 672721397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672721853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134103 + ... + 139028.

It is an arithmetic number, because the mean of its divisors is an integer number (112257252).

Almost surely, 2^672721653 is an apocalyptic number.

It is an amenable number.

672721653 is a deficient number, since it is larger than the sum of its proper divisors (225336363).

672721653 is a wasteful number, since it uses less digits than its factorization.

672721653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273955.

The product of its digits is 105840, while the sum is 39.

The square root of 672721653 is about 25936.8782431502. The cubic root of 672721653 is about 876.2172567932.

The spelling of 672721653 in words is "six hundred seventy-two million, seven hundred twenty-one thousand, six hundred fifty-three".