82666406 has 4 divisors (see below), whose sum is σ = 123999612. Its totient is φ = 41333202.

The previous prime is 82666387. The next prime is 82666417. The reversal of 82666406 is 60466628.

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

It is a self number, because there is not a number n which added to its sum of digits gives 82666406.

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, 20666600 + ... + 20666603.

It is an arithmetic number, because the mean of its divisors is an integer number (30999903).

Almost surely, 2^82666406 is an apocalyptic number.

82666406 is a deficient number, since it is larger than the sum of its proper divisors (41333206).

82666406 is a wasteful number, since it uses less digits than its factorization.

82666406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41333205.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 82666406 is about 9092.1067965571. The cubic root of 82666406 is about 435.6218806002.

The spelling of 82666406 in words is "eighty-two million, six hundred sixty-six thousand, four hundred six".