82129727 has 4 divisors (see below), whose sum is σ = 83877216. Its totient is φ = 80382240.

The previous prime is 82129693. The next prime is 82129741. The reversal of 82129727 is 72792128.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82129727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82129777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 873674 + ... + 873767.

It is an arithmetic number, because the mean of its divisors is an integer number (20969304).

Almost surely, 2^82129727 is an apocalyptic number.

82129727 is a deficient number, since it is larger than the sum of its proper divisors (1747489).

82129727 is a wasteful number, since it uses less digits than its factorization.

82129727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747488.

The product of its digits is 28224, while the sum is 38.

The square root of 82129727 is about 9062.5452826455. The cubic root of 82129727 is about 434.6771321543.

The spelling of 82129727 in words is "eighty-two million, one hundred twenty-nine thousand, seven hundred twenty-seven".