82191886 has 16 divisors (see below), whose sum is σ = 142195680. Its totient is φ = 34901280.

The previous prime is 82191871. The next prime is 82191913. The reversal of 82191886 is 68819128.

It is a super-2 number, since 2×82191886² = 13511012248473992, which contains 22 as substring.

It is a congruent 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, 25405 + ... + 28456.

It is an arithmetic number, because the mean of its divisors is an integer number (8887230).

Almost surely, 2^82191886 is an apocalyptic number.

82191886 is a deficient number, since it is larger than the sum of its proper divisors (60003794).

82191886 is a wasteful number, since it uses less digits than its factorization.

82191886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53979.

The product of its digits is 55296, while the sum is 43.

The square root of 82191886 is about 9065.9740789393. The cubic root of 82191886 is about 434.7867647374.

The spelling of 82191886 in words is "eighty-two million, one hundred ninety-one thousand, eight hundred eighty-six".