81849108 has 48 divisors (see below), whose sum is σ = 208958400. Its totient is φ = 24729600.

The previous prime is 81849091. The next prime is 81849149. The reversal of 81849108 is 80194818.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58578 + ... + 59958.

It is an arithmetic number, because the mean of its divisors is an integer number (4353300).

Almost surely, 2^81849108 is an apocalyptic number.

It is an amenable number.

81849108 is an abundant number, since it is smaller than the sum of its proper divisors (127109292).

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

81849108 is a wasteful number, since it uses less digits than its factorization.

81849108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848 (or 1846 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 81849108 is about 9047.0496848420. The cubic root of 81849108 is about 434.1815022301.

The spelling of 81849108 in words is "eighty-one million, eight hundred forty-nine thousand, one hundred eight".