672686191 has 4 divisors (see below), whose sum is σ = 677525800. Its totient is φ = 667846584.

The previous prime is 672686171. The next prime is 672686207. The reversal of 672686191 is 191686276.

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 672686191 - 2¹¹ = 672684143 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 (672686171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2419596 + ... + 2419873.

It is an arithmetic number, because the mean of its divisors is an integer number (169381450).

Almost surely, 2^672686191 is an apocalyptic number.

672686191 is a deficient number, since it is larger than the sum of its proper divisors (4839609).

672686191 is a wasteful number, since it uses less digits than its factorization.

672686191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4839608.

The product of its digits is 217728, while the sum is 46.

The square root of 672686191 is about 25936.1946129343. The cubic root of 672686191 is about 876.2018601517.

The spelling of 672686191 in words is "six hundred seventy-two million, six hundred eighty-six thousand, one hundred ninety-one".