81608366 has 8 divisors (see below), whose sum is σ = 139900080. Its totient is φ = 34975008.

The previous prime is 81608357. The next prime is 81608377. The reversal of 81608366 is 66380618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2914571 + ... + 2914598.

It is an arithmetic number, because the mean of its divisors is an integer number (17487510).

Almost surely, 2^81608366 is an apocalyptic number.

81608366 is a deficient number, since it is larger than the sum of its proper divisors (58291714).

81608366 is a wasteful number, since it uses less digits than its factorization.

81608366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5829178.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 81608366 is about 9033.7348865240. The cubic root of 81608366 is about 433.7553995568.

The spelling of 81608366 in words is "eighty-one million, six hundred eight thousand, three hundred sixty-six".