672737191 has 4 divisors (see below), whose sum is σ = 768842512. Its totient is φ = 576631872.

The previous prime is 672737183. The next prime is 672737203. The reversal of 672737191 is 191737276.

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 672737191 - 2³ = 672737183 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 (672737101) 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, 48052650 + ... + 48052663.

It is an arithmetic number, because the mean of its divisors is an integer number (192210628).

Almost surely, 2^672737191 is an apocalyptic number.

672737191 is a deficient number, since it is larger than the sum of its proper divisors (96105321).

672737191 is an equidigital number, since it uses as much as digits as its factorization.

672737191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96105320.

The product of its digits is 111132, while the sum is 43.

The square root of 672737191 is about 25937.1777763117. The cubic root of 672737191 is about 876.2240028022.

The spelling of 672737191 in words is "six hundred seventy-two million, seven hundred thirty-seven thousand, one hundred ninety-one".