671662857 has 4 divisors (see below), whose sum is σ = 895550480. Its totient is φ = 447775236.

The previous prime is 671662837. The next prime is 671662879. The reversal of 671662857 is 758266176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 671662857 - 2⁷ = 671662729 is a prime.

It is a super-2 number, since 2×671662857² = 902261986946804898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671662837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111943807 + ... + 111943812.

It is an arithmetic number, because the mean of its divisors is an integer number (223887620).

Almost surely, 2^671662857 is an apocalyptic number.

It is an amenable number.

671662857 is a deficient number, since it is larger than the sum of its proper divisors (223887623).

671662857 is a wasteful number, since it uses less digits than its factorization.

671662857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223887622.

The product of its digits is 846720, while the sum is 48.

The square root of 671662857 is about 25916.4591910238. The cubic root of 671662857 is about 875.7573228968.

The spelling of 671662857 in words is "six hundred seventy-one million, six hundred sixty-two thousand, eight hundred fifty-seven".