671378 has 4 divisors (see below), whose sum is σ = 1007070. Its totient is φ = 335688.

The previous prime is 671369. The next prime is 671383. The reversal of 671378 is 873176.

It is a happy number.

671378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 644809 + 26569 = 803^2 + 163^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167843 + ... + 167846.

2⁶⁷¹³⁷⁸ is an apocalyptic number.

671378 is a deficient number, since it is larger than the sum of its proper divisors (335692).

671378 is a wasteful number, since it uses less digits than its factorization.

671378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335691.

The product of its digits is 7056, while the sum is 32.

The square root of 671378 is about 819.3765922944. The cubic root of 671378 is about 87.5633500418.

The spelling of 671378 in words is "six hundred seventy-one thousand, three hundred seventy-eight".