81906110 has 96 divisors (see below), whose sum is σ = 180182016. Its totient is φ = 26611200.

The previous prime is 81906109. The next prime is 81906113. The reversal of 81906110 is 1160918.

It is a super-2 number, since 2×81906110² = 13417221710664200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 81906110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81906113) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 644867 + ... + 644993.

It is an arithmetic number, because the mean of its divisors is an integer number (1876896).

Almost surely, 2^81906110 is an apocalyptic number.

81906110 is an abundant number, since it is smaller than the sum of its proper divisors (98275906).

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

81906110 is a wasteful number, since it uses less digits than its factorization.

81906110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 81906110 is about 9050.1994453161. The cubic root of 81906110 is about 434.2822708740.

The spelling of 81906110 in words is "eighty-one million, nine hundred six thousand, one hundred ten".