82771857 has 12 divisors (see below), whose sum is σ = 136639360. Its totient is φ = 47298168.

The previous prime is 82771837. The next prime is 82771879. The reversal of 82771857 is 75817728.

It is not a de Polignac number, because 82771857 - 2¹⁰ = 82770833 is a prime.

It is a super-2 number, since 2×82771857² = 13702360622456898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82771807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 656857 + ... + 656982.

Almost surely, 2^82771857 is an apocalyptic number.

It is an amenable number.

82771857 is a deficient number, since it is larger than the sum of its proper divisors (53867503).

82771857 is a wasteful number, since it uses less digits than its factorization.

82771857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313852 (or 1313849 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 82771857 is about 9097.9039893813. The cubic root of 82771857 is about 435.8070313619.

The spelling of 82771857 in words is "eighty-two million, seven hundred seventy-one thousand, eight hundred fifty-seven".