671567705 has 8 divisors (see below), whose sum is σ = 807525504. Its totient is φ = 536158000.

The previous prime is 671567693. The next prime is 671567737. The reversal of 671567705 is 507765176.

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

It is not a de Polignac number, because 671567705 - 2¹² = 671563609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134321 + ... + 139230.

It is an arithmetic number, because the mean of its divisors is an integer number (100940688).

Almost surely, 2^671567705 is an apocalyptic number.

It is an amenable number.

671567705 is a deficient number, since it is larger than the sum of its proper divisors (135957799).

671567705 is a wasteful number, since it uses less digits than its factorization.

671567705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274047.

The product of its (nonzero) digits is 308700, while the sum is 44.

The square root of 671567705 is about 25914.6233814038. The cubic root of 671567705 is about 875.7159658403.

The spelling of 671567705 in words is "six hundred seventy-one million, five hundred sixty-seven thousand, seven hundred five".