672543845 has 8 divisors (see below), whose sum is σ = 807485976. Its totient is φ = 537746176.

The previous prime is 672543811. The next prime is 672543881. The reversal of 672543845 is 548345276.

It can be written as a sum of positive squares in 4 ways, for example, as 13184161 + 659359684 = 3631^2 + 25678^2 .

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 672543845 - 2¹⁴ = 672527461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 672543796 and 672543805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25592 + ... + 44721.

It is an arithmetic number, because the mean of its divisors is an integer number (100935747).

Almost surely, 2^672543845 is an apocalyptic number.

It is an amenable number.

672543845 is a deficient number, since it is larger than the sum of its proper divisors (134942131).

672543845 is a wasteful number, since it uses less digits than its factorization.

672543845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72231.

The product of its digits is 806400, while the sum is 44.

The square root of 672543845 is about 25933.4503103617. The cubic root of 672543845 is about 876.1400519216.

The spelling of 672543845 in words is "six hundred seventy-two million, five hundred forty-three thousand, eight hundred forty-five".