671491387 has 8 divisors (see below), whose sum is σ = 767967200. Its totient is φ = 575152704.

The previous prime is 671491351. The next prime is 671491409. The reversal of 671491387 is 783194176.

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

It is not a de Polignac number, because 671491387 - 2²³ = 663102779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671491987) 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, 23562 + ... + 43567.

It is an arithmetic number, because the mean of its divisors is an integer number (95995900).

Almost surely, 2^671491387 is an apocalyptic number.

671491387 is a deficient number, since it is larger than the sum of its proper divisors (96475813).

671491387 is a wasteful number, since it uses less digits than its factorization.

671491387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68565.

The product of its digits is 254016, while the sum is 46.

The square root of 671491387 is about 25913.1508504852. The cubic root of 671491387 is about 875.6827920082.

The spelling of 671491387 in words is "six hundred seventy-one million, four hundred ninety-one thousand, three hundred eighty-seven".