671021857 has 8 divisors (see below), whose sum is σ = 733368672. Its totient is φ = 608899200.

The previous prime is 671021851. The next prime is 671021863. The reversal of 671021857 is 758120176.

It is an interprime number because it is at equal distance from previous prime (671021851) and next prime (671021863).

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

It is a cyclic number.

It is not a de Polignac number, because 671021857 - 2¹⁵ = 670989089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671021851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49744 + ... + 61777.

It is an arithmetic number, because the mean of its divisors is an integer number (91671084).

Almost surely, 2^671021857 is an apocalyptic number.

It is an amenable number.

671021857 is a deficient number, since it is larger than the sum of its proper divisors (62346815).

671021857 is a wasteful number, since it uses less digits than its factorization.

671021857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112079.

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 671021857 is about 25904.0895806048. The cubic root of 671021857 is about 875.4786418538.

The spelling of 671021857 in words is "six hundred seventy-one million, twenty-one thousand, eight hundred fifty-seven".