671670785 has 16 divisors (see below), whose sum is σ = 812439936. Its totient is φ = 533065728.

The previous prime is 671670781. The next prime is 671670803. The reversal of 671670785 is 587076176.

It is a cyclic number.

It is not a de Polignac number, because 671670785 - 2² = 671670781 is a prime.

It is a super-2 number, since 2×671670785² = 902283286845032450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671670781) 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, 362732 + ... + 364578.

It is an arithmetic number, because the mean of its divisors is an integer number (50777496).

Almost surely, 2^671670785 is an apocalyptic number.

It is an amenable number.

671670785 is a deficient number, since it is larger than the sum of its proper divisors (140769151).

671670785 is a wasteful number, since it uses less digits than its factorization.

671670785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392.

The product of its (nonzero) digits is 493920, while the sum is 47.

The square root of 671670785 is about 25916.6121435654. The cubic root of 671670785 is about 875.7607685623.

The spelling of 671670785 in words is "six hundred seventy-one million, six hundred seventy thousand, seven hundred eighty-five".