672717891 has 8 divisors (see below), whose sum is σ = 898145104. Its totient is φ = 447884640.

The previous prime is 672717827. The next prime is 672717919. The reversal of 672717891 is 198717276.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 672717891 - 2⁶ = 672717827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 672717891.

It is not an unprimeable number, because it can be changed into a prime (672712891) 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, 145840 + ... + 150381.

It is an arithmetic number, because the mean of its divisors is an integer number (112268138).

Almost surely, 2^672717891 is an apocalyptic number.

672717891 is a deficient number, since it is larger than the sum of its proper divisors (225427213).

672717891 is a wasteful number, since it uses less digits than its factorization.

672717891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296981.

The product of its digits is 296352, while the sum is 48.

The square root of 672717891 is about 25936.8057208285. The cubic root of 672717891 is about 876.2156234602.

The spelling of 672717891 in words is "six hundred seventy-two million, seven hundred seventeen thousand, eight hundred ninety-one".