82171864 has 8 divisors (see below), whose sum is σ = 154072260. Its totient is φ = 41085928.

The previous prime is 82171853. The next prime is 82171871. The reversal of 82171864 is 46817128.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5135734 + ... + 5135749.

Almost surely, 2^82171864 is an apocalyptic number.

It is an amenable number.

82171864 is a deficient number, since it is larger than the sum of its proper divisors (71900396).

82171864 is a wasteful number, since it uses less digits than its factorization.

82171864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10271489 (or 10271485 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 82171864 is about 9064.8697729201. The cubic root of 82171864 is about 434.7514570852.

The spelling of 82171864 in words is "eighty-two million, one hundred seventy-one thousand, eight hundred sixty-four".