671471378 has 4 divisors (see below), whose sum is σ = 1007207070. Its totient is φ = 335735688.

The previous prime is 671471351. The next prime is 671471393. The reversal of 671471378 is 873174176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 660335809 + 11135569 = 25697^2 + 3337^2 .

It is a super-2 number, since 2×671471378² = 901747622946437768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167867843 + ... + 167867846.

Almost surely, 2^671471378 is an apocalyptic number.

671471378 is a deficient number, since it is larger than the sum of its proper divisors (335735692).

671471378 is a wasteful number, since it uses less digits than its factorization.

671471378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335735691.

The product of its digits is 197568, while the sum is 44.

The square root of 671471378 is about 25912.7647695108. The cubic root of 671471378 is about 875.6740941001.

The spelling of 671471378 in words is "six hundred seventy-one million, four hundred seventy-one thousand, three hundred seventy-eight".