673640891 has 8 divisors (see below), whose sum is σ = 839864064. Its totient is φ = 524914920.

The previous prime is 673640867. The next prime is 673640897. The reversal of 673640891 is 198046376.

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 673640891 - 2¹⁰ = 673639867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673640897) 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, 4374215 + ... + 4374368.

It is an arithmetic number, because the mean of its divisors is an integer number (104983008).

Almost surely, 2^673640891 is an apocalyptic number.

673640891 is a deficient number, since it is larger than the sum of its proper divisors (166223173).

673640891 is a wasteful number, since it uses less digits than its factorization.

673640891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8748601.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 673640891 is about 25954.5928690858. The cubic root of 673640891 is about 876.6161764178.

The spelling of 673640891 in words is "six hundred seventy-three million, six hundred forty thousand, eight hundred ninety-one".