816057857 has 8 divisors (see below), whose sum is σ = 844495872. Its totient is φ = 787752000.

The previous prime is 816057839. The next prime is 816057877. The reversal of 816057857 is 758750618.

It is a happy number.

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 816057857 - 2⁶ = 816057793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816057877) 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, 20393 + ... + 45254.

It is an arithmetic number, because the mean of its divisors is an integer number (105561984).

Almost surely, 2^816057857 is an apocalyptic number.

It is an amenable number.

816057857 is a deficient number, since it is larger than the sum of its proper divisors (28438015).

816057857 is a wasteful number, since it uses less digits than its factorization.

816057857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66079.

The product of its (nonzero) digits is 470400, while the sum is 47.

The square root of 816057857 is about 28566.7263962814. The cubic root of 816057857 is about 934.4878306820.

The spelling of 816057857 in words is "eight hundred sixteen million, fifty-seven thousand, eight hundred fifty-seven".