81610214 has 8 divisors (see below), whose sum is σ = 139903248. Its totient is φ = 34975800.

The previous prime is 81610211. The next prime is 81610219. The reversal of 81610214 is 41201618.

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

It is a super-3 number, since 3×81610214³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81610214.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81610211) 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, 2914637 + ... + 2914664.

It is an arithmetic number, because the mean of its divisors is an integer number (17487906).

Almost surely, 2^81610214 is an apocalyptic number.

81610214 is a deficient number, since it is larger than the sum of its proper divisors (58293034).

81610214 is a wasteful number, since it uses less digits than its factorization.

81610214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5829310.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 81610214 is about 9033.8371692211. The cubic root of 81610214 is about 433.7586736245.

The spelling of 81610214 in words is "eighty-one million, six hundred ten thousand, two hundred fourteen".