82666731 has 16 divisors (see below), whose sum is σ = 126156800. Its totient is φ = 47167488.

The previous prime is 82666721. The next prime is 82666741. The reversal of 82666731 is 13766628.

It is an interprime number because it is at equal distance from previous prime (82666721) and next prime (82666741).

It is not a de Polignac number, because 82666731 - 2¹⁰ = 82665707 is a prime.

It is a super-2 number, since 2×82666731² = 13667576828452722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 82666731.

It is not an unprimeable number, because it can be changed into a prime (82666711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13590 + ... + 18708.

It is an arithmetic number, because the mean of its divisors is an integer number (7884800).

Almost surely, 2^82666731 is an apocalyptic number.

82666731 is a deficient number, since it is larger than the sum of its proper divisors (43490069).

82666731 is a wasteful number, since it uses less digits than its factorization.

82666731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5898.

The product of its digits is 72576, while the sum is 39.

The square root of 82666731 is about 9092.1246691849. The cubic root of 82666731 is about 435.6224514767.

The spelling of 82666731 in words is "eighty-two million, six hundred sixty-six thousand, seven hundred thirty-one".