671990493 has 16 divisors (see below), whose sum is σ = 910397376. Its totient is φ = 440832000.

The previous prime is 671990393. The next prime is 671990507. The reversal of 671990493 is 394099176.

It is not a de Polignac number, because 671990493 - 2⁸ = 671990237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671990393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58743 + ... + 69243.

It is an arithmetic number, because the mean of its divisors is an integer number (56899836).

Almost surely, 2^671990493 is an apocalyptic number.

It is an amenable number.

671990493 is a deficient number, since it is larger than the sum of its proper divisors (238406883).

671990493 is a wasteful number, since it uses less digits than its factorization.

671990493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10844.

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 671990493 is about 25922.7794227394. The cubic root of 671990493 is about 875.8996973938.

The spelling of 671990493 in words is "six hundred seventy-one million, nine hundred ninety thousand, four hundred ninety-three".