671329405 has 16 divisors (see below), whose sum is σ = 890072064. Its totient is φ = 483493120.

The previous prime is 671329391. The next prime is 671329409. The reversal of 671329405 is 504923176.

It is not a de Polignac number, because 671329405 - 2⁷ = 671329277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671329409) 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, 169741 + ... + 173650.

It is an arithmetic number, because the mean of its divisors is an integer number (55629504).

Almost surely, 2^671329405 is an apocalyptic number.

It is an amenable number.

671329405 is a deficient number, since it is larger than the sum of its proper divisors (218742659).

671329405 is a wasteful number, since it uses less digits than its factorization.

671329405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343436.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 671329405 is about 25910.0251833147. The cubic root of 671329405 is about 875.6123735040.

The spelling of 671329405 in words is "six hundred seventy-one million, three hundred twenty-nine thousand, four hundred five".