673720735 has 4 divisors (see below), whose sum is σ = 808464888. Its totient is φ = 538976584.

The previous prime is 673720717. The next prime is 673720739. The reversal of 673720735 is 537027376.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 673720735 - 2⁵ = 673720703 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673720739) 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 3 ways as a sum of consecutive naturals, for example, 67372069 + ... + 67372078.

It is an arithmetic number, because the mean of its divisors is an integer number (202116222).

Almost surely, 2^673720735 is an apocalyptic number.

673720735 is a deficient number, since it is larger than the sum of its proper divisors (134744153).

673720735 is a wasteful number, since it uses less digits than its factorization.

673720735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134744152.

The product of its (nonzero) digits is 185220, while the sum is 40.

The square root of 673720735 is about 25956.1309713139. The cubic root of 673720735 is about 876.6508090031.

It can be divided in two parts, 6737 and 20735, that added together give a palindrome (27472).

The spelling of 673720735 in words is "six hundred seventy-three million, seven hundred twenty thousand, seven hundred thirty-five".