81210606 has 8 divisors (see below), whose sum is σ = 162421224. Its totient is φ = 27070200.

The previous prime is 81210601. The next prime is 81210629. The reversal of 81210606 is 60601218.

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

81210606 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81210601) 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, 6767545 + ... + 6767556.

It is an arithmetic number, because the mean of its divisors is an integer number (20302653).

Almost surely, 2^81210606 is an apocalyptic number.

81210606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81210606 is a wasteful number, since it uses less digits than its factorization.

81210606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13535106.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 81210606 is about 9011.6927377713. The cubic root of 81210606 is about 433.0495421271.

The spelling of 81210606 in words is "eighty-one million, two hundred ten thousand, six hundred six".