671878491 has 8 divisors (see below), whose sum is σ = 898719744. Its totient is φ = 446478120.

The previous prime is 671878481. The next prime is 671878499. The reversal of 671878491 is 194878176.

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

It is not a de Polignac number, because 671878491 - 2¹³ = 671870299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671878499) 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, 359131 + ... + 360996.

It is an arithmetic number, because the mean of its divisors is an integer number (112339968).

Almost surely, 2^671878491 is an apocalyptic number.

671878491 is a deficient number, since it is larger than the sum of its proper divisors (226841253).

671878491 is a wasteful number, since it uses less digits than its factorization.

671878491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720441.

The product of its digits is 677376, while the sum is 51.

The square root of 671878491 is about 25920.6190319599. The cubic root of 671878491 is about 875.8510320383.

The spelling of 671878491 in words is "six hundred seventy-one million, eight hundred seventy-eight thousand, four hundred ninety-one".