673643971 has 24 divisors (see below), whose sum is σ = 909460224. Its totient is φ = 484529760.

The previous prime is 673643959. The next prime is 673643983. The reversal of 673643971 is 179346376.

It is an interprime number because it is at equal distance from previous prime (673643959) and next prime (673643983).

It is not a de Polignac number, because 673643971 - 2¹⁵ = 673611203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673643171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12871 + ... + 38896.

It is an arithmetic number, because the mean of its divisors is an integer number (37894176).

Almost surely, 2^673643971 is an apocalyptic number.

673643971 is a deficient number, since it is larger than the sum of its proper divisors (235816253).

673643971 is a wasteful number, since it uses less digits than its factorization.

673643971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51811 (or 51798 counting only the distinct ones).

The product of its digits is 571536, while the sum is 46.

The square root of 673643971 is about 25954.6522034105. The cubic root of 673643971 is about 876.6175124282.

The spelling of 673643971 in words is "six hundred seventy-three million, six hundred forty-three thousand, nine hundred seventy-one".